[U-Boot] fastboot boot base address behaviour

[Rob Herring]

On Wed, Apr 29, 2015 at 9:25 AM, Tom Rini <trini at konsulko.com> wrote:
> On Wed, Apr 29, 2015 at 09:11:03AM -0500, Rob Herring wrote:
>
> [snip]
>> >> For arm64 Image, the image header defines the offset and u-boot must
>> >> load it to that offset or you won't boot. There's only 1 correct
>> >> address and 2^32 - 1 wrong addresses the boot.img could have.
>> >
>> > Ok, so the simplest thing to do would be to always relocate the kernel
>> > then.
>>
>> Probably so as it is likely smaller than the ramdisk and needing
>> decompression also (once we support arm64 Image.gz).
>
> Not to side-track things much but we "support" Image.gz today but yes as
> a two-step thing.  I think there was some talk about trying to be clever
> enough to decompress the first page so we could peek at the Image
> header, see where things needed to end up, and then decompress to that
> location but it either wasn't feasible or more likely didn't get too
> high in priority.

Is that documented how somewhere? Presumably it is load, gunzip,
booti? This would not work if contained within a boot.img. We'd need
the auto detect as you mention.

Rob