Hi Mike,
Sorry, I am partly off-topic.
but since cross compiling and uboot images are still close to uboot,
i'll stay here.
Am 05.03.2013 21:30, schrieb Michael Cashwell:
On Mar 5, 2013, at 2:25 PM, JPT <j-...@gmx.net> wrote:
*** Next step, booting from disk
...
this works, but the kernel doesn't know where to find the root partition.
how do I have to pass the root= parameter to linux kernel?
this didn't work:
set bootargs console=ttyS0,115200 root=/dev/sda1
bootargs is how you pass arguments to the kernel, so you're on track there.
The trick is what to pass. Your root= item is in the right direction.
But the kernel needs to be configured appropriately.
By that I'm talking about things like what bus (ATA, SATA, USB, etc.),
what partitioning (MBR, GUID, MTD, etc.) and what file system (FAT*, ext2/3/4,
etc.) the root fs will have.
You have to have the supporting kernel configs enabled for those things.
If I boot using the initrd, the USB drive is /dev/sda1
Since it's the same kernel, I guessed I have to use /dev/sda1 as well.
You also need /dev to be setup early or the root argument will hit a dead end.
I use these often:
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
I am rather sure missing DEVTMPFS is the problem.
after hours and days of searching I found out:
DEVTMPFS is not available in kernel 2.6.31.*, it's included from 2.6.34 on.
Way 1: Upgrade to longterm kernel 2.6.34.14
A) build kernel
Tries to crosscompile but fails:
"arm-mv5sft-linux-gnueabi-gcc: not found"
did hardly find anything on this file in the internet.
Since I haven't got any experience with crosscompiling, I set up a ARM
machine in QEMU... but it still tries to crosscompile, same error.
B) patch new kernal with duov2 patches. boy, its a 20 MB patchfile!
a lot of patches failed.
I don't believe this is going to work!
Way 2: Patch original kernel with DEVTMPFS.
No idea, did not try yet. where do I get a patch from?
Still need a way to compile the kernel.
Way 3: Create a new uboot initrd.img
is there any way to unpack the original image into it's pieces? Would be
far easier to just exchange those parts that have to be changed.
Way 4: see below.
Or do I have to boot the "real" system after booting from initrd?
You need to decide that.
How do I boot "linux from linux"?
could you give a keyword to search for?
thanks,
Jan
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