Andy,
On 14 July 2017 at 17:30, Andy Yan andyshrk@gmail.com wrote:
Hi:
2017-07-13 15:33 GMT+08:00 Bin Chen bin.chen@linaro.org:
Hi Tom,
Thanks for the review.
On 13 July 2017 at 04:25, Tom Rini trini@konsulko.com wrote:
On Tue, Jul 11, 2017 at 03:56:04PM +1000, Bin Chen wrote:
It's my understanding that we are supposed to use booti, instead of
bootm,
for arm64 image. But booti lacks of android image support. Bootm has the andriod image support but lack of the arm64 image handling.
So, what is suppose the right way of booting an android arm64 image? or, should we create a separate command?
This patch is an invitation for that discussion.
It *hacked* the booti command and it aslo assume the dtb is in the
second area
of android boot image. It also has other belives like u-boot should be in control of where to put the kernnel/ramdisk/dtb images so it
ignores
the value specified in the android images.
Signed-off-by: Bin Chen bin.chen@linaro.org
So, booti is very much for the "Image" format described in the Linux kernel in Documentation/arm64/booting.txt. One can (and people have) used bootm on aarch64 for "uImage" style kernels and FIT kernels, and I would see being able to boot an aarch64 Android image with bootm as the way to go forward.
Are you suggesting that we should use bootm path, instead of booti?
I have two questions regarding this:
- currently arm64 kernel don't have a uImage kernel target. And I'm not
sure if adding that will be something that is wanted and/or sensible.
It seems that bootm doesn't always require a uImage kernel. Consider we use bootm to boot a ARM32 based android boot.img. we pack the zImage in boot.img directly, without make it to uImage .
You are right!
- bootm path doesn't have the logic that is currently in the booti, such
as the kernel relocation.
Also, one other question raised during internal discussion was why the booti was created in the first place, if we could have had that implemented in the bootm path.
The analogy would be that we use bootm for Android on arm not bootz. Thanks!
-- Tom
-- Regards, Bin _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot