Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK Data Sheet
Product codes
AT91SAM9X25-EK
56
SAM9X25 [DATASHEET]
11054E–ATARM–10-Mar-2014
Figure 11-7. Structure of the ARM Vector 6
The value has to be smaller than 24 kbytes. This size is the internal SRAM size minus the stack size used by the ROM
Code at the end of the internal SRAM.
Code at the end of the internal SRAM.
Example
An example of valid vectors follows:
00
ea000006
B0x20
04
eafffffe
B0x04
08
ea00002f
B_main
0c
eafffffe
B0x0c
10
eafffffe
B0x10
14
00001234
B0x14
<- Code size = 4660 bytes
18
eafffffe
B0x18
11.4.3.2 boot.bin File Check
This method is the one used on FAT formatted SDCard. The boot program must be a file named “boot.bin” written in
the root directory of the filesystem. Its size must not exceed the maximum size allowed: 24 kbytes (0x6000).
the root directory of the filesystem. Its size must not exceed the maximum size allowed: 24 kbytes (0x6000).
11.4.4 Detailed Memory Boot Procedures
11.4.4.1 NAND Flash Boot: NAND Flash Detection
After NAND Flash interface configuration, a reset command is sent to the memory.
The Boot Program first tries to find valid software on a NAND Flash device connected to EBI CS3, with data lines
connected to D0-D7, then on NAND Flash connected to D16-D23. Hardware ECC detection and correction are provided
by the PMECC peripheral (refer to the PMECC section in the datasheet for more information).
connected to D0-D7, then on NAND Flash connected to D16-D23. Hardware ECC detection and correction are provided
by the PMECC peripheral (refer to the PMECC section in the datasheet for more information).
The Boot Program is able to retrieve NAND Flash parameters and ECC requirements using two methods as follows:
The detection of a specific header written at the beginning of the first page of NAND Flash,
or
Through the ONFI parameters for ONFI compliant memories.
31
0
Size of the code to download in bytes