Hello list, I (first time poster and newly FR enjoy-er) try to boot from SD-card. I want to make a second environment in which I can experiment _without_ changing the software that the phone ships with. That is, without making all to big changes to the original software on the phone.
I followed the instructions 'Boot_from_sd_card' on the wiki [1]. I used: - Openmoko-scaredycat-openmoko-devel-image-glibc-ipk-P1-Snapshot-20080507-om-gta02.rootfs.tar.gz - uImage-2.6.24+git20080507-r0-om-gta02.bin ==> Result: kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2) Than I downloaded "Openmoko-Freerunner-20080424-om-gta02.rootfs.jffs2" and "uImage-2.6.24+git20080424-om-gta02.bin" (exactly the same files installed on the phone I believe) in order to write/copy these to SD-card. However, I don't know how to write/copy the jffs2 file to SD-card. (I cannot find the same file in 'tar.gz' format.) As I understand the filetype jffs2 is an image comparable with a iso-image of a cd [2]. I learned that it is possible to mount it as a 'loopback' device in order to read from the .jffs2 [3]. I also learned that the 'dd'-command (see[4]) can be used to create a .jffs2. ==>While learning all this, a totally different approach crossed my mind: Would it be possible to duplicate (with the use of dd) the standard environment (the FR ships with) to SD-card (in order to create a second environment)? Would it be possible to duplicate (with the use of dd) any environment (on the FR) for back-up purposes (and put it back when necessary)? Would it be helpful when such a method is described on the wiki? How would the command look like? I was guessing: - dd if=/dev/mtdblock2 of=/dev/mmcblk0p1 (assuming see[5] _/proc/mtd mtd2_(kernel) maps to /dev/mtdblock2) - dd if=/dev/mtdblock4 of=/dev/mmcblk0p2 (assuming see[5] _/proc/mtd mtd4_(rootfs) maps to /dev/mtdblock4) Because the source(blocksize??) and destination(partition sixe??) will differ in size, the commands above probably need extra parameters. (If this method works at all: Probably I'm totally wrong.) At the moment I'm most interested in answers to the questions above. However, tips / help with the 'kernel panic' is also much appreciated. (To be clear: The FR still boots, but not from SD-card!) Issues I checked are: - Kernel and filesystem 'fit' together. - File system: <snip> [EMAIL PROTECTED]:~# cat /etc/mtab | grep mmcblk0 /dev/mmcblk0p1 /mnt/mokokernel vfat rw,fmask=0022,dmask=0022,codepage=cp437,iocharset=iso8859-1 0 0 /dev/mmcblk0p2 /mnt/moko ext2 rw 0 0 </snip> - u-boot environment: <snip> [EMAIL PROTECTED]: # command below 'stolen' from http://wiki.openmoko.org/wiki/Uboot. [EMAIL PROTECTED]: sudo ./dfu-util -a u-boot_env -R -U env.in [EMAIL PROTECTED]: cat env.in [...] menu_1=Boot from microSD (FAT+ext2): setenv bootargs ${bootargs_base} root fstype=ext2 root=/dev/mmcblk0p2 rootdelay=5 ${mtdparts} ro; mmcinit; fatload m mc 1 0x32000000 ${sd_image_name}; bootm 0x32000000 [...] </snip> Thanks, A.dre [1] http://wiki.openmoko.org/wiki/Boot_from_sd_card [2] http://lists.openmoko.org/nabble.html#nabble-td472598%7Ca472694 [3] http://wiki.openmoko.org/wiki/Userspace_root_image#Mount_on_loopback_device [4] dd if=/dev/mtdblock0 of=<rootfs.jffs2> (for explanation see[3]) [5] http://wiki.openmoko.org/wiki/Bricked#Useful_information _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community