WO2006074793A1 - Method and device for initializing a booting procedure of a mobile device - Google Patents
Method and device for initializing a booting procedure of a mobile device Download PDFInfo
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- WO2006074793A1 WO2006074793A1 PCT/EP2005/013767 EP2005013767W WO2006074793A1 WO 2006074793 A1 WO2006074793 A1 WO 2006074793A1 EP 2005013767 W EP2005013767 W EP 2005013767W WO 2006074793 A1 WO2006074793 A1 WO 2006074793A1
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- flash memory
- nand flash
- memory device
- read command
- command sequence
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/4401—Bootstrapping
- G06F9/4403—Processor initialisation
Definitions
- the present invention generally relates to a method and a device for initializing a booting procedure of an electronic device such as a mobile terminal . More specifically, the invention relates to a method, a record carrier, and a device for initializing a booting procedure of a mobile platform device having a certain NAND flash memory device .
- a memory device for an existing mobile phone includes a flash memory device for storing a program for controlling the operation and function of the mobile phone and a Random Access Memory (RAM) or the like for executing the program.
- the flash memory device has been either a NOR-type memory device or a NAND-type memory device . Because of its high capacity, low cost, fast overall performance, long life span, etc . many mobile phone manufacturers are exploring the NAND-type flash memory device for code storage .
- booting The general procedure of starting up or resetting a mobile phone, or any similar electronic device, is known as booting or bootstrap .
- the purpose of booting is to bring the operating system of the mobile phone into a state of readiness .
- Booting a mobile phone in the case where the code is stored in a NAND flash memory device sets certain requirements on the mobile platform device that is implemented in the mobile phone . Since a NAND flash memory device does not support random access of data a NAND flash memory device typically requires a command to be sent that readies the NAND flash memory device to be read .
- a microprocessor therefore normally executes a primary boot code that is embodied on an on-chip ROM of a Base Band ASIC (i . e .
- the primary boot code which is sometimes also referred to as the bootstrapper, applies a certain read command sequence to the NAND memory device in order to determine the way the NAND memory device requires read commands to appear on a data bus .
- NAND flash memory device models require different read command sequences when reading from the NAND flash memory device .
- the primary boot code when booting from a NAND flash memory device it is important for the primary boot code to read from the beginning of a first block of the NAND device (i . e . the beginning of the block where the boot image is stored) in order to access any further information that configures the mobile platform device and hence the mobile phone .
- the primary boot code when performing these - initial read operations , the primary boot code however does not know to which type of read command sequence that the NAND flash memory device is responsive .
- NAND flash memory manufacturers have offered relatively few models of NAND flash memories on the market . Furthermore, most of these models have no other way of determining the characteristics of the NAND memory device apart from reading off the manufacturer and/or NAND flash memory device identifier . As a consequence, up to now many mobile phone manufacturers have decided on a certain NAND flash memory device model to use in its different mobile platform devices for further implementation in its various mobile phone products .
- NAND flash memory models are e . g . K9F1208U0M and K9F1GXXX0M from SAMSUNG, and TC58DVG02A1 and TC58NVG0S3A from TOSHIBA.
- the above object is achieved by a method of initializing a booting procedure of a mobile platform device having a certain NAND flash memory device .
- the method comprises sending a first read command sequence to said NAND flash memory device, and detecting if said NAND flash memory device is responsive to the first read command sequence . If said NAND flash memory device is responsive to the first read command sequence the mobile platform device will be configured to interface with said NAND flash memory device .
- the method further comprises sending a second read command sequence which is associated with the first read command sequence to said NAND flash memory device, and detecting if said NAND flash memory device is responsive to the second read command sequence . If said NAND flash memory device is responsive to the second read command sequence the mobile platform device will be configured to interface with said NAND flash memory device .
- the first read command sequence comprises a first command and a plurality of address cycles and the second read command sequence is a second command . If so, the second read command sequence may preferably be added to the first read command sequence .
- the step of detecting if said NAND flash memory device is responsive to said first read command sequence may further comprise waiting for a first acknowledgement notification to be issued by said NAND flash memory device within a predetermined time , and if issued detecting said first acknowledgement notification .
- the first acknowledgement notification is issued when said NAND flash memory device is responsive to said first read command sequence .
- the first acknowledgement notification may be a busy signal .
- the predetermined time is in the range of 10-25 ⁇ s .
- the step of detecting if said NAND flash memory device is responsive to said second read command sequence may further comprise waiting for a second acknowledgement notification to be issued by said NAND flash memory device within a predetermined time , and if issued detecting the second acknowledgement notification .
- the second acknowledgement notification is issued when said NAND flash memory device is responsive to said second read command sequence .
- the second acknowledgement notification may be a busy signal .
- said predetermined time is in the range of 10-25 ⁇ s .
- the method may also comprise, after the step of configuring the mobile platform device, the further step of booting from said NAND flash memory device in accordance with the read command sequence to which said NAND flash memory device is responsive .
- the method may also comprise, before sending the first read command sequence, resetting said NAND flash memory device .
- the above obj ect is achieved by a record carrier having embodied thereon a computer program for processing by a microprocessor, wherein the computer program comprises a code segment for performing the method according the first aspect of the invention .
- the record carrier may preferably be a Read Only Memory device .
- the above object is achieved by a device for performing the method according to the first aspect of the invention . More specifically, the above object is achieved by a device for initializing a booting procedure of a mobile platform device having a certain NAND flash memory device .
- the device comprises sending means for sending a first and second read command sequence to said NAND flash memory device, wherein said second read command sequence is also associated with said first read command sequence .
- the device further comprises detecting means for detecting if said NAND flash memory device is responsive to either of the first or second read command sequence .
- the sending means is adapted to configure the mobile platform device to interface with said NAND flash memory device in accordance with the read command sequence to which it is responsive .
- the sending means may also be adapted to send the first and second read command sequences via a NAND interface circuit .
- the first read command sequence comprises a first command and a plurality of address cycles and the second read command sequence is a second command . If so, the second read command sequence may preferably be added to the first read command sequence .
- the detecting means may also be configured to wait for an acknowledgement notification, for a pre-determined period of time, to be issued by said NAND flash memory device .
- the acknowledgement notification is issued when said NAND flash memory device is responsive to the read command sequence that is sent .
- the detecting means may also sample for the acknowledgement notification during the pre-determined period of time, and if the acknowledgement notification is issued it is further capable of detecting the acknowledgement notification .
- the acknowledgement notification may for example be a busy signal .
- the sending means could preferably also be adapted to send a reset command to said NAND flash memory device .
- the device according to the third aspect of the invention could preferably be an application specific integrated circuit device (ASIC) such as a baseband ASIC .
- ASIC application specific integrated circuit device
- the sending means may preferably be a bootstrapper .
- the bootstrapper may be incorporated in the NAND interface circuit .
- the detecting means may be a microprocessor.
- the above obj ect is achieved by a mobile platform device comprising a NAND flash memory device, a databus and a device according to the third aspect of the invention .
- the device according to the third aspect of the invention is interconnected with the NAND flash memory device, and the databus .
- the mobile platform device could for example be incorporated in an electronic device .
- the mobile platform device may e . g. be incorporated in a mobile terminal such as a mobile telephone .
- Fig . 1 shows a mobile terminal in which the present invention could be practiced and a mobile telecommunication network in which the mobile terminal may operate .
- Fig . 2 shows a block diagram of a first embodiment of a mobile platform device utilizing an associated NAND flash memory device .
- Fig . 3 shows a flowchart illustrating a method according to a first embodiment of the invention of distinguishing between two different NAND flash memory device models .
- Fig . 4 shows an illustrative timing diagram of a process of transferring boot code from a NAND flash memory device being of NANDl-model .
- Fig . 5 shows an illustrative timing diagram of a process of transferring boot code from a NAND flash memory device being of NAND2-model .
- Fig . 1 illustrates a mobile terminal 100 , in the form of a mobile telephone, as one exemplifying electronic device in which the mobile platform device according to the invention may be advantageously provided . It also shows a possible environment in which the mobile terminal 100 may operate .
- the mobile terminal 100 may comprise an antenna 101.
- a microphone 102 , a loudspeaker 103, a keypad 104 , and a display 105 provide a man-machine interface for operating the mobile terminal 100.
- the mobile terminal 100 may in operation be connected to a radio station 110 (base station) of a mobile communication network 111 such as GSM, UMTS, PCS, and/or DCS network, via a first radio link 112 by means of the antenna 101.
- the mobile terminal 100 may also comprise a DSP, a transceiver, etc .
- mobile terminal when used hereinafter includes all devices such as mobile telephones, portable radio communication equipments , smartphones or the like .
- FIG. 2 An exemplary mobile platform device 200 according to a first embodiment is illustrated in Fig . 2.
- the mobile platform device 200 is adapted to be incorporated in a mobile terminal 100 according to Fig . 1 and further has an associated NAND flash memory device 220 for storing a program for controlling the operation and function of the mobile terminal 100.
- the mobile platform device 200 comprises an application specific integrated circuit (ASIC) device 210, such as a baseband ASIC, and a NAND flash memory device 220.
- the mobile platform device 200 further comprises an external databus 230 for transferring of data between the ASIC 210, and the NAND flash memory device 220.
- the mobile platform device 200 comprises components of a mobile platform device 200 that is booted by an initializing program. Such initializing program is commonly referred to as a boot code . It is to be understood that according to alternative embodiments a mobile platform device may comprise alternative components than those shown in Fig . 2. The components shown, however, are sufficient to disclose an illustrative embodiment for practicing the present invention .
- the ASIC device 210 may comprise a microprocessor (CPU) 211, a NAND interface circuit 212 , a RAM 213, a bootstrapper 214 and an internal databus 240 interconnecting the components for transferring data therebetween .
- the ASIC is preferably, but not necessarily, embodied on a single semiconductor chip and it generally manages any associated memory such as the NAND flash memory device 220, which is connected to the ASIC 210 through the external databus 230.
- the NAND flash memory device 220 is organized in a set of blocks that in turn is divided into a set of pages . Typically, but not necessarily, blocks are of size 16 or 64 kB and pages have a size of 512 or 2048 bytes . Reading, writing, and erasing data in the NAND memory device 220 is normally performed by means of the CPU 211 issuing a command followed by two, three, four, five and possibly- more address cycles and then optionally transferring the data (i . e . when reading/writing data) . The number of required address cycles is model specific and depends on the memory size and/or organization of the NAND flash memory device used .
- the NAND flash memory- device is typically equipped with for example 8 or 16 I/O- pins and also a number of control pins (such as CLE, CE, WE, ALE, RE) and status pins , such as e . g . busy pin, for connection to the NAND interface 212. Some of the pins are only used for commands and status information whereas others are only used for data transfers . Blocks in a NAND flash memory device may be invalid or "bad" and therefore it may be preferred to implement some kind of bad block management .
- the very first block which is located on the OxOO block address , is normally fully guaranteed to be a valid block and hence does not require Error Correction.
- the first block of a NAND flash memory device suitable for storing the boot image, i . e . an exact copy of the boot code necessary for booting of the mobile platform device 200 and which exact copy of the boot code is to be placed (copied) into the RAM 213.
- the boot image is preferably stored from the beginning of the first block of the NAND memory device . It may also be restricted to fit within this first block .
- the NAND flash memory device 220 may also store an operating system (OS ) and application programs for controlling the operation and function of the mobile terminal 100, and may also be used as a user data storing area during the operation of the mobile terminal 100.
- OS operating system
- the CPU 211 is adapted to execute the OS, applications and operation programs . During the very first initialization operations the CPU 211 is also adapted to execute the necessary primary boot code that is stored in the bootstrapper 214. The CPU 211 will thus provide the overall control of the mobile terminal so as to perform the functions inherent in the mobile terminal 100.
- the internal databus 240 transfers data to and from the CPU 211 and between the NAND interface 212 , the RAM 213 , and the bootstrapper 214.
- the RAM 213 is preferably a Random Access Memory (RAM) .
- RAM Random Access Memory
- the necessary boot code that is first stored in the NAND flash memory device 220 will eventually be transferred to the internal RAM 213. After transfer of the boot code is completed, the boot code can be executed therefrom by means of the CPU 211.
- the boot code when executed by the CPU 211 initializes the ASIC 210, the NAND flash memory device 220 , and any further peripheral devices .
- the bootstrapper 214 Upon initializing, i . e . in response to a mobile platform device initializing signal, the bootstrapper 214 is adapted to perform the very first initialization operations of the booting procedure . Accordingly, the bootstrapper 214 includes the necessary primary boot code that is responsible for the very first initialization operations of the mobile platform device 200. The primary boot code is accordingly adapted to interpret or load and execute the boot image of the NAND flash memory device 220. In response to a mobile platform device initializing signal the primary boot code stored in the bootstrapper 214 will thus be executed by means of the CPU 211.
- the ASIC 210 is also provided with a NAND interface circuit 212 in order to interface with the associated NAND flash memory device 220. This is done by loading each command and address on an external databus 230.
- the NAND interface circuit 212 may optionally also perform an error control function that may be required during NAND interfacing .
- the boot code is pre- stored (in advance ) in the NAND flash memory device 220 that is to be incorporated in the mobile platform device 200.
- characteristics information (such as page size, block size, etc . ) pertaining to the associated NAND memory device 220 is integrated into the NAND flash memory device 220.
- the characteristics information is model specific for the NAND flash memory device 220 and comprises configuration information .
- the characteristics information is stored in a relatively small area, which is preferably, but not necessarily, less than 0x100 bytes, in the beginning of the first block of the NAND memory device . Yet further, it is possible to read this relatively small area . This can be done in a way that is common to a plurality of NAND flash memory device models . Here common means that it is common except from the fact that different read command sequences are required for different NAND flash memory device models . It is assumed that the associated NAND flash memory device 220 is initially unknown, i . e . upon initializing of the booting procedure .
- NAND flash memory device 220 connected with the ASIC 210 in the mobile platform device 200 is either of two different NAND-models , NANDl-model or NAND2-model .
- the invention should of course not be construed as limited to these exemplary NAND-models or to only two different models .
- a NANDl-model is a NAND flash memory device model such as the "K9F1208U0M 512Kb" from SAMSUNG
- a NAND2-model is a NAND flash memory device model such as "K9F1G08U0M IGb" from SAMSUNG.
- NAND flash memory device models which are similar to the NANDl- and NAND2-models above are offered by other manufacturers also (e . g . Toshiba' s NANDl : TC58DVG02A1 and NAND2 : TC58NVG0S3A) .
- NANDl- and NAND2-models require different read command sequences during a read operation .
- a difference between the NANDl-model and the NAND2-model is that NAND2-models allow a read command 0x30, whereas this is not the case for NANDl-models .
- Examplary read command sequences for NANDl- and NAND2-models are illustrated in Figs . 4 and 5, respectively. Fig .
- read command sequence when used in this specification and claims is to be understood as a sequence comprising a read command and N (i . e . , O ... n) additional address cycles .
- the primary boot code comprised in the bootstrapper 214 Upon initializing, i . e . in response to a mobile platform device initializing signal, the primary boot code comprised in the bootstrapper 214 will be executed by means of the CPU 211.
- the mobile platform device initializing signal thus includes a power-up signal (i . e . generated when the mobile platform device is powered up) , or a reset signal .
- the associated NAND flash memory device 220 will be set to a known state .
- this Upon execution of the primary boot code stored in the bootstrapper 214 this will be accomplished by sending a reset command OxFF to the associated NAND flash memory device . Resetting the NAND flash memory device 220 is done in order to reset the mobile platform device 200 and thereby put it into a known state .
- the bootstrapper 214 waits for a busy signal, via a busy pin, that is issued by the NAND flash memory device 220 to become inactive, i . e . logic high in this embodiment, meaning that the mobile platform system is reset .
- a busy signal means that the busy pin of the NAND flash memory device is or becomes inactive .
- the status of the busy signal can be detected by means of the CPU 211 via the NAND interface 212. Thereby, the CPU 211 is capable of being informed whether the NAND flash memory device 220 has been reset or not .
- the busy pin will be driven inactive, e . g . by an on-chip pull-up .
- the CPU 211 will consequently be informed that the associated NAND flash memory device 220 is reset (although in practice there was no NAND flash memory device connected) . It has turned out that it is good practice to begin with resetting the mobile platform device 200 before proceeding with further method steps .
- step 304 the primary boot code comprised in the bootstrapper is executed by means of the CPU 211 so that an initial read command sequence is sent from the bootstrapper 214 , through the NAND-interface circuit 212 , to the associated NAND flash memory device 220 assuming that the associated NAND flash memory device is of a NANDl- model, i . e . a NAND flash memory device being responsive to read command sequences in accordance with NANDl-models .
- the number of required address cycles ( following the read command) differs for different NAND models in dependence of their memory size and/or memory organization .
- the number of required address cycles that must be sent in association with the initial read command sequence therefore depends on the memory size and/or memory organization of the NAND flash memory devices that is to be supported by the mobile platform device . It is to be appreciated that one should allow as many address cycles (adN' s) required by the largest NAND flash memory device that one wishes to be supported by a specific mobile platform device . In this exemplary embodiment it is to be understood that the mobile platform device 200 is to support a NAND flash memory device requiring maximum 4 address cycles (ad3 ) as NAND2- models allow any number (adN' s) of address cycles .
- the step of sending the read command sequence comprises sending the read command 0x00 followed by four address cycles in the sequence adO, adl, ad2 , and ad3.
- adO is 0x00
- adl is 0x00
- ad2 is 0x01
- ad3 is 0x00 in order to check if the associated NAND memory device 220 is of NANDl-model .
- the address for the addressing modes of both NANDl and NAND2 (which are to be tested according to this embodiment) , should be big enough to be outside the first block of the NAND flash memory device 220 but still small enough to be within the address range of the NAND memory device 220.
- the reason for the access to an address that is beyond the first block is to avoid a possible and undesired auto-load functionality of the NAND memory device 220, which might prevent the busy signal to be activated if the address of the first page of the NAND flash memory device 220 had been used.
- step 305 it is checked (by means of the CPU 211 ) whether a busy signal has been issued by means of the NAND flash memory device 220 within a predetermined time .
- the busy signal is checked ( sampled) by means of the CPU until the busy signal is detected or the predetermined time has elapsed .
- the busy signal is issued by the NAND flash memory device after it responds to the sent initial read command sequence (if it responds) and there may be some delay.
- an issued busy signal means that a busy pin of the NAND flash memory device becomes active .
- An active busy pin i . e . logic low indicates that the NAND flash memory device 220 that is connected to the ASIC 210 is of NANDl-model .
- the predetermined time should be long enough to ensure that the busy signal can be issued by the NAND flash memory device 220 prior to the busy signal is sampled by the CPU 211. Moreover, the predetermined time should not be too long as that slows down the procedure of initializing the booting .
- the predetermined time could e . g . be in the range 10-25 ⁇ s .
- the predetermined time is preset to approximately 10 ⁇ s . It has turned out that it is guaranteed that the NAND flash memory device issues the busy signal (the busy pin goes active) within 10 ⁇ s .
- step 306 the bootstrapper will be able to configure the mobile platform device 200 to interface with the associated NAND flash memory device 220 as soon as the busy signal has been deactivated (i . e . busy- pin has been deactivated) .
- the busy signal has been deactivated (i . e . busy- pin has been deactivated)
- subsequent booting from the connected NANDl memory device is enabled, since it is now possible to further read out characteristics information from the connected NANDl memory device .
- the general principles of a subsequent booting procedure will be described later .
- step 307 the primary boot code comprised in the bootstrapper will then be further executed by means of the CPU 211 so that another read command sequence is sent to the NAND flash memory device 220.
- the another read command sequence does not necessarily have to comprise a sequence of a read command and one or more address cycles . Rather, in this exemplary embodiment it is sufficient to send a read command 0x30 (read start) as a continuation of the initial read command sequence in order to check if the associated NAND memory device is of NAND2-model .
- a read command 0x30 is simply added to the already sent initial read command sequence . Again, it is to be noted that a command 0x30 is not allowed to be issued to NANDl-models .
- step 308 it is checked (by means of the CPU 211 ) whether a busy signal has been issued by means of the NAND flash memory device 220 within a predetermined time in a similar manner as described above . Again, the busy signal is checked ( sampled) by means of the CPU until the busy signal is detected or the predetermined time has elapsed . The busy signal is issued by the NAND flash memory device after it responds to the sent another read command sequence (if it responds ) and there may be some delay .
- An active, i . e . logic low, busy signal indicates that there is a NAND flash memory device connected to the ASIC 210. Furthermore, it is established that the connected NAND flash memory device 220 is of NAND2-model, because the NAND flash memory device 220 is responsive to the sent another read command sequence . If an active busy signal (i . e . active busy pin) is detected by the CPU 211 , also the bootstrapper 214 will be informed that the connected NAND flash memory device 220 is of NAND2-model .
- the bootstrapper will be able to configure the mobile platform device, in step 309, to function with the connected NAND2-model as soon as the busy- signal has been deactivated (i . e . busy pin has been deactivated) .
- the busy- signal i . e . busy pin has been deactivated
- subsequent booting from the connected NAND2 memory device may follow since it is now possible to further read out characteristics information from the connected NAND2 memory device .
- step 308 if there is no busy signal detected in step 308 it will be concluded that there is neither a NANDl-model nor a NAND2-model connected with the ASIC 210. This could mean that there is no NAND memory device 220 at all associated with the mobile platform device 200. It could equally possible mean that a connected memory device is of a type other than NANDl and NAND2.
- the above example has described a method according to a first embodiment by which it is possible to distinguish between two different read command sequences (pertaining to two different NAND-models, i . e . NANDl and NAND2 ) when accessing a connected initially unknown NAND memory device .
- the method could include further method steps in order to distinguish between further NAND-models by applying yet further read command sequences . If so, and if any further NAND model would be larger than the described NAND-models the initial read command sequence would have to comprise as many address cycles as required by such larger NAND model (e . g . the initial read command sequence could be OxOO adO, adl, ad2 , ad3 , ad4 if the such larger NAND-model requires five address cycles) .
- the method could also comprise further steps for trying to boot from non-NAND memory devices . This would mean an even more flexible and cost-effective mobile platform device .
- a subsequent booting procedure may proceed, because it is then possible to read out further characteristics information relating to the connected NAND flash memory device .
- the subsequent booting procedure will be performed in accordance with the specific procedure that adheres to the connected NAND-model . Although the booting procedure differs depending on the
- NAND-model e . g. with regard to the required read command sequences
- the principle is in general similar for most NAND-models . Therefore, the general principle of reading out a boot code stored in a NAND flash memory device 220 by the bootstrapper 214 and transferring the read-out boot code to the RAM 213 will now be described below with reference to Figs . 2 and 4. This is done in order to provide an outline of the complete booting of a mobile terminal 100.
- Fig . 4 shows an illustrative timing diagram of a process of transferring boot code from the NAND flash memory device 220. It is to be assumed that that the connected NAND flash memory device 220 is of a NANDl-model . As soon as it has been established that the connected NAND flash memory device 220 is of a NANDl-model the bootstrapper will be able to further output control signals (e . g . CLE, CE, WE, ALE, R/B, and RE) to read out the boot code that is stored in the boot image of the NAND flash memory device 220. In practice, the bootstrapper 214 controls the control signals more or less directly, via the NAND interface circuit 212 , depending on how much the NAND interface circuit 212 automates the NAND operations .
- control signals e . g . CLE, CE, WE, ALE, R/B, and RE
- the command latch enable signal CLE is activated when a predetermined command is input to the NAND flash memory device 220.
- the address latch enable signal ALE is activated when a predetermined address is input to the NAND flash memory device 220.
- the NAND flash memory device 220 receives the predetermined read command (in this example 0x00 ) via the external bus 230 in response to an active, i . e . logic high, command latch enable signal CLE, an active, i . e . logic low, chip enable signal CE and an active write enable signal WE . It is to be understood that here, and in the following " " represents an active low state .
- the NAND flash memory device 220 receives an address via the external bus 230 in response to an active address enable signal ALE, an active chip enable signal CE , and an active write enable signal WE .
- the bootstrapper 214 Upon execution of the primary boot code stored in the bootstrapper 214 , the bootstrapper 214 generates the predetermined read command 0x00 to read out the boot code stored in the NAND flash memory device 220. Thereafter it generates the addresses adO, adl, ad2 and ad3. Since the connected NAND flash memory device 220 is of NANDl-model this will be detected in accordance with the principles described previously with regard to the first embodiment . Thus , as it is determined that the connected NAND memory device 220 is of NANDl-model it will be possible to further read out the boot code stored in the NAND flash memory device 220. The data read is then temporarily stored in an internal buffer (not shown) of the NAND flash memory device 220.
- a ready/busy signal RIB Upon an active logic, i . e . x low' , of a ready/busy signal RIB , the copy operation of the data (e ⁇ g . the boot code; in this example d ⁇ , dl, d2 and d3) to the internal buffer is completed. However, upon an inactive logic, i . e . ⁇ high' , of the ready/busy signal RlB the copy operation of the data is not completed. Consequently, upon activation of the read enable signal RE the data d0 through d3 is transferred to the external databus 230.
- active logic i . e . x low'
- the data d ⁇ , dl, d2 , and d3 on the bus 230 are transferred, via the NAND interface circuit 212 , to the RAM 213.
- the bootstrapper 214 then stores the boot code in the RAM 213. Thereafter, executing the boot code that is loaded into the RAM 213 by means of the CPU 211 causes the different hardware components of the mobile platform device 200 to be initialized . When incorporated into a mobile terminal, the mobile platform device 200 will thus eventually be able to operate and function properly .
- the present invention has been described above with reference to a specific embodiment . However, other embodiments than the above are equally possible within the scope of the invention .
- the present invention may be embodied in many different forms and should not be construed as limited to the embodiment set forth herein. Rather, the embodiment is provided so that the disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art .
- the present invention may be embodied as methods or devices . Consequently, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects . The description should therefore not be taken in a limiting sense .
Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US11/813,788 US7971046B2 (en) | 2005-01-14 | 2005-02-18 | Method and device for initializing a booting procedure of a mobile device |
JP2007550703A JP4995737B2 (en) | 2005-01-14 | 2005-12-21 | Method and device for initializing the startup procedure of a mobile device |
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US64440005P | 2005-01-14 | 2005-01-14 | |
US60/644,400 | 2005-01-14 | ||
EP05003505.4A EP1681628B1 (en) | 2005-01-14 | 2005-02-18 | Method and device for initializing a booting procedure of a mobile device |
EP05003505.4 | 2005-02-18 |
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US8171192B2 (en) | 2005-09-20 | 2012-05-01 | Qualcomm Incorporated | Hardware-assisted device configuration detection |
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