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Minor update to AT25BOOT; Updated README file

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This commit is contained in:
Gregory Nutt 2014-06-28 12:38:41 -06:00
parent c3c8c86873
commit 2dad150289
2 changed files with 27 additions and 0 deletions
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20
configs/sama5d4-ek/README.txt
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@ -424,6 +424,11 @@ Creating and Using DRAMBOOT
you don't have SAM-BA, an alternative is to use the AT25BOOT program
described in the next section.
STATUS: I don't have a working SAM-BA at the moment and there are issues
with my AT25BOOT (see below). I currently work around these issues by
putting DRAMBOOT on a microSD card (as boot.bin). The RomBOOT loader does
boot that image without issue.
Creating and Using AT25BOOT
===========================
@ -513,6 +518,11 @@ Creating and Using AT25BOOT
Serial Flash. (2) If using SAM-BA, make sure that you load the DRAM
boot program into the boot area via the pull-down menu.
STATUS: While this program works great and appears to correctly write
the binary image onto the AT25 Serial FLASH, the RomBOOT loader will
not boot it! I believe that is because the secure boot loader has some
undocumented requirements that I am unaware of. (2014-6-28)
Running NuttX from SDRAM
========================
@ -3038,6 +3048,11 @@ Configurations
The usage is different, otherwise I believe the notes for the dramboot
configuration should all apply.
STATUS: While this program works great and appears to correctly write
the binary image onto the AT25 Serial FLASH, the RomBOOT loader will
not boot it! I believe that is because the secure boot loader has some
undocumented requirements that I am unaware of. (2014-6-28)
dramboot:
This is a little program to help debug of code in DRAM. It does the
@ -3119,6 +3134,11 @@ Configurations
gdb> mon reg pc (make sure that the PC is 0x200040
gdb> ... and debug ...
STATUS: I don't have a working SAM-BA at the moment and there are issues
with my AT25BOOT (see above). I currently work around these issues by
putting DRAMBOOT on a microSD card (as boot.bin). The RomBOOT loader does
boot that image without issue.
nsh:
This configuration directory provide the NuttShell (NSH). This is a

7
configs/sama5d4-ek/src/at25_main.c
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@ -184,6 +184,13 @@ int at25_main(int argc, char *argv)
return EXIT_FAILURE;
}
/* Replace the vector at offset 0x14 with the size of the image to load
* into SRAM. The RomBOOT loader expects to find this size at that
* location.
*/
*(uint32_t *)(SAM_DDRCS_VSECTION + 0x14) = memoutstream.public.nput;
/* The HEX file load was successful, write the data to FLASH */
printf("Successfully loaded the Intel HEX file into memory...\n");