My goal is to have a ‘standard’ flavour of Linux (in my case – Fedora) running on the APC, and one of the major pre-requisites was to have the system boot from the micro-SD card, instead of the internal ‘flash memory’..    Looking at all the U-Boot parameters, I had expected this to be a real pain, but in fact when examining the output from the initial boot process, it appeared the the APC was already trying to boot from the micro-SD card first, and then going on to boot from internal flash when this failed..

<boot>
Initial SD/MMC Card Fail!
No MMC card found
** Unable to use mmc 0:1 for fatload **
## Checking Image at 00000000 ...
   Bad Magic Number
Initial SD/MMC Card Fail!
No MMC card found
** Unable to use mmc 0:1 for fatload **
** Unable to use mmc 0:1 for fatload **
## Checking Image at 01000000 ...
   Bad Magic Number
No MMC card found
Load Image Form NAND Flash
USE_HW_ECC ECC12bit

Read NAND Flash OK

## Checking Image at 01000000 ...
   Image Name:   Linux-2.6.32.9-default
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    2969192 Bytes =  2.8 MB
etc.............

So… I formatted a micro-SD card with one partition of 500MB FAT32 and the second (the rest) as EXT2 (as the Android system didn’t appear to support EXT3 etc..)

Then I copied the appropriate files from the acp-firmware-v1.0 directory (after unzipping it..) to the FAT32 boot partition, and some of the relevant Linux-related xxx.tgz files from acp-firmware-v1.0/packages/wmt to the EXT2 partition, and expanded them:   I didn’t copy all the application-specific files across, as I simply wanted to see if it would work, at this stage

I then put the micro-SD card into the slot in the APC, and booted, and amazingly – it worked!:

# boot

Initial SD/MMC Card OK!
SD/MMC clock is 44Mhz
register mmc device
part_offset : 800, cur_part : 1
part_offset : 800, cur_part : 1
reading scriptcmd

142 bytes read

## Checking Image at 00000000 ...
   Image Name:   
   Image Type:   ARM Linux Script (gzip compressed)
   Data Size:    78 Bytes =  0.1 kB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
## Executing script at 00000000
Saving Environment to Flash...
Un-Protected 1 sectors
Un-Protected 1 sectors
Erasing Flash...
ok.
Erased 1 sectors
Writing to Flash... done
Protected 1 sectors
Protected 1 sectors

Initial SD/MMC Card OK!
SD/MMC clock is 44Mhz
register mmc device
part_offset : 800, cur_part : 1
part_offset : 800, cur_part : 1
reading uzImage.bin

2969256 bytes read
part_offset : 800, cur_part : 1
reading initrd.gz

3231913 bytes read

## Checking Image at 01000000 ...
   Image Name:   Linux-2.6.32.9-default
   Image Type:   ARM Linux Kernel Image (uncompressed) 
           ............etc.........etc
.
.
Please press Enter to activate this console.

BUT……Now I have to work out why – despite changing the boot parameters in U-Boot, the rootfs is not being correctly set…