On Tue, Nov 8, 2011 at 2:10 AM, Simon Glass <s...@chromium.org> wrote:
> Can I assume that we have (or can have) a 'make uImage' target or
> similar in the kernel which can pack together:
>
> - a compressed kernel (not zImage, I mean something that U-Boot can
> decompress), with a rel_offset of 32KB
As explained by Nico, having the boot loader decompress the
kernel is *bad*.
> - a DTB
> - a ramdisk
When testing various systems I already usually use a uImage with
zImage+initramfs+DTB. This is frowned upon in some places but
it works like this:
I attach the initramfs from a cpio file rather than from giving a file
path list. This is rather popular in some embedded systems.
I configure it in like this with the config script
(you can also use menuconfig or interactive config...):
scripts/config --file .config \
--enable BLK_DEV_INITRD \
--set-str INITRAMFS_SOURCE rootfs.cpio \
--enable INITRAMFS_COMPRESSION_GZIP \
--enable RD_GZIP
Since this was so convenient I made a patch to attach a DTB
the same way which was floated on devicetree-discuss:
http://www.mail-archive.com/devicetree-discuss@lists.ozlabs.org/msg07256.html
Nico didn't like that:
http://www.mail-archive.com/devicetree-discuss@lists.ozlabs.org/msg06828.html
Alas, I'm still using that patch though. For systems where I cannot
influence the boot loader it's easiest, since I just add another
config snippet when I want to run them with DT:
scripts/config --file .config \
--enable USE_OF \
--enable ARM_APPENDED_DTB \
--enable ARM_ATAG_DTB_COMPAT \
--enable PROC_DEVICETREE \
--set-str ARM_APPENDED_DTB_FILE my-device-tree.dtb
Yours,
Linus Walleij
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