[OpenWrt-Devel] [PATCH] kirkwood: include kernel images and DTB in rootfs

[Daniel Golle]

Hi Nathan,

I don't believe that files inside UBIFS rootfs is the right approach for
kernel and dtb. Given that the bootloader already supports UBI, why not
use use a UBI volume instead?
While U-Boot does support reading files from UBIFS, squashfs inside UBI
volumes are not supported (squashfs inside read-only UBI volume is
desirable if you like having the features depending on ROM+overlay such as
failsafe and factory restore similar to other hardware targets).

The Kirkwood target is part of OpenWrt for a long while already, longer
than proper UBI support is around and long before wasting any thoughts
about rootfs_overlay on NAND.
Our current "state of the art" is to have squashfs read-only rootfs, just
like on NOR devices, using UBIFS as rootfs_overlay (instead of JFFS2 on
NOR). For bootloaders supporting UBI it makes sense to store kernel (and
DTB) in a UBI volume and load them from there.
Take a look at SysupgradeNAND and UbinizeImage targets in image.mk for
examples.


Cheers


Daniel



On Fri, Jan 23, 2015 at 08:57:57PM -0800, Nathan Hintz wrote:
> For SheevaPlug and GuruPlug devices.
> 
> Signed-off-by: Nathan Hintz <nlhintz at hotmail.com>
> ---
>  target/linux/kirkwood/profiles/120-plug.mk | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/target/linux/kirkwood/profiles/120-plug.mk b/target/linux/kirkwood/profiles/120-plug.mk
> index dcbda71..473955d 100644
> --- a/target/linux/kirkwood/profiles/120-plug.mk
> +++ b/target/linux/kirkwood/profiles/120-plug.mk
> @@ -7,6 +7,7 @@
>  
>  define Profile/SHEEVAPLUG
>    NAME:=Globalscale Technologies SheevaPlug
> +  DEPENDS:=+ at TARGET_ROOTFS_INCLUDE_KERNEL + at TARGET_ROOTFS_INCLUDE_ZIMAGE + at TARGET_ROOTFS_INCLUDE_DTB
>    PACKAGES:= \
>  	kmod-mmc kmod-mvsdio kmod-usb2 kmod-usb-storage \
>  	kmod-of-i2c kmod-i2c-core kmod-i2c-mv64xxx \
> @@ -24,6 +25,7 @@ $(eval $(call Profile,SHEEVAPLUG))
>  
>  define Profile/SHEEVAPLUGSATA
>    NAME:=Globalscale Technologies eSATA SheevaPlug
> +  DEPENDS:=+ at TARGET_ROOTFS_INCLUDE_KERNEL + at TARGET_ROOTFS_INCLUDE_ZIMAGE + at TARGET_ROOTFS_INCLUDE_DTB
>    PACKAGES:= \
>  	kmod-mmc kmod-mvsdio kmod-usb2 kmod-usb-storage \
>  	kmod-of-i2c kmod-i2c-core kmod-i2c-mv64xxx \
> @@ -42,6 +44,7 @@ $(eval $(call Profile,SHEEVAPLUGSATA))
>  
>  define Profile/Guruplug-Server-Plus
>    NAME:=Globalscale Technologies Guruplug Server Plus
> +  DEPENDS:=+ at TARGET_ROOTFS_INCLUDE_KERNEL + at TARGET_ROOTFS_INCLUDE_ZIMAGE + at TARGET_ROOTFS_INCLUDE_DTB
>    PACKAGES:= \
>  	kmod-mmc kmod-mvsdio kmod-usb2 kmod-usb-storage \
>  	kmod-of-i2c kmod-i2c-core kmod-i2c-mv64xxx \
> -- 
> 1.9.3
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