at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 100

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Figure 13-6. Serial DataFlash Download
13.5
6249D–ATARM–20-Dec-07
SD Card Boot
The DataFlash has a Status Register that determines all the parameters required to access the
device. The DataFlash boot is configured to be compatible with the future design of the
DataFlash.
The SD Card Boot program searches for a valid application in the SD Card memory.
It looks for a boot.bin file in the root directory of a FAT12/16/32 formatted SD Card. If a valid file
is found, this application is loaded into internal SRAM and executed by branching at address
0x0000_0000 after remap. This application may be the application code or a second-level
bootloader.
Read the DataFlash into the internal SRAM.
Restore the reset value for the peripherals.
Set the PC to 0 and perform the REMAP
Read the first 7 instructions (28 bytes).
to jump to the downloaded application
(code size to read in vector 6)
Decode the sixth ARM vector
(except vector 6) are LDR
Send status command
or Branch instruction
Is status OK ?
7 vectors
Start
End
Yes
Yes
No
No
AT91SAM9263 Preliminary
Jump to next boot
solution
100