6 messages in org.openmoko.lists.device-ownersRe: Booting from SD Card using FreeRu...| From | Sent On | Attachments |
|---|---|---|
| Simon Moore | Jul 3, 2008 11:30 pm | |
| Christian Kuester | Jul 4, 2008 12:48 am | |
| Christian Kuester | Jul 4, 2008 12:58 am | |
| Neng-Yu Tu (Tony Tu) | Jul 4, 2008 7:48 pm |  .new |
| jlu...@escomposlinux.org | Jul 5, 2008 5:13 am | |
| Simon Moore | Jul 5, 2008 10:30 am |
| Subject: | Re: Booting from SD Card using FreeRunner (as shipped)? | |
|---|---|---|
| From: | Simon Moore (sim...@snmoore.net) | |
| Date: | Jul 5, 2008 10:30:00 am | |
| List: | org.openmoko.lists.device-owners | |
jlu...@escomposlinux.org wrote:
Simon,
I'm generally running into two problems:
1. Nothing I've tried allows it to successfully mount the rootfs e.g. from /dev/mmcblk0p2 (using FAT+ext2 partitions on the SD Card)
That is easy change the format of the ext2 partition to ext3, the kernels have ext2 in a module and ext3 is built in.
2. 'savenv' appears to fail - it does an Erase, then drops back to the uBoot prompt; I've only ever had it once do an Erase...Write cycle
That as Tony tu says may be caused from using the NOR u-boot
Thanks to all for the information and advice - I've now got a successful SD card boot.
Observations ========= 1a. The default boot environment settings do not work e.g. a boot from NOR (or NAND with the default settings) results in:
VFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2) Please append a correct "root=" boot option; here are the available partitions: <snip> Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)
This can be fixed by applying Tony's 'env.new' fix, which does work ok!
1a. FAT + ext2 does not work, but FAT + ext3 does work e.g. booting from NAND after applying Tony's 'env.new' fix using FAT + ext2 results in:
No filesystem could mount root, tried: ext3, cramfs, msdos, vfat, ramfs Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)
2. The 'saveenv' problem was due to me being stupid and mixing NOR and NAND boots - it works quite correctly from a NAND boot
Conclusions ========= To achieve a successful boot from SD Card using a FreeRunner as shipped:
A. Format the SD Card as FAT + ext3, not FAT + ext2 B. Adjust the NAND boot environment settings (e.g. by applying Tony's suggested 'env.new' fix) and boot from NAND
Which is going to make life challenging for non-Linux users (e.g. OS X and Windows), as the above is only really practical on a Linux machine with a working dfu-util and ext3 support. One (slightly difficult) way might be to set-up the USB networking first, perform the SD Card formatting on the FreeRunner itself via SSH, then use 'screen' etc to hand edit the NAND boot environment settings.
Cheers, Simon
-- Simon Moore User:SNMoore on the wiki