[U-Boot] U-Boot overlaps BSS and initrd on arm64

[Tom Rini]

On Tue, Nov 08, 2016 at 09:41:13AM -0800, Dmitry Vyukov wrote:
> Hello,
> 
> We've got a boot problem on arm64 devices. Here is boot log:
> https://storage.kernelci.org/mainline/v4.9-rc4/arm64-defconfig+CONFIG_KASAN=y/lab-baylibre-seattle/boot-juno-r2.txt
> https://kernelci.org/boot/id/581ece5a59b514e448f03bd7/
> 
> Here is some debugging that Andrey and Mark did:
> 
> On Tue, Nov 8, 2016 at 2:00 AM, Andrey Ryabinin wrote:
> > I've looked at juno-r2: https://kernelci.org/boot/id/581ece5a59b514e448f03bd7/
> > So we have
> > Dtb address  0x81f00000
> > Load address 0x80000000
> > Which gives us 31Mb for kernel.
> >
> > It says that Kernel image is 24.62 MiB, but that's without BSS.
> > If bss is big enough it might overwrite dtb.
> > And indeed, build details -
> > https://kernelci.org/build/id/581e850959b514e564f03bdc/
> > shows that bss is 8.5 Mb which is enough to overlap with dtb.
> 
> On Tue, Nov 8, 2016 at 3:21 AM, Mark Rutland wrote:
> > FWIW, since v3.17 we've had an image_size field in the arm64 Image
> > header which describes the "real" size of the Image, BSS included. See
> > [1,2].
> > It should be possible to modify U-Boot to use that to automatically
> > place the DTB and initrd at non-clashing locations (or at least to
> > expose the value somehow).
> > I had assumed U-Boot already did that, but it doesn't seem to be the
> > case.

Yes, we've supported the image_size field since v2016.07 and that board
is running v2016.01.  Unfortunately the booting.txt changes that added
the image_size field weren't publicized widely so we didn't see it until
someone else ran into the problem you're describing.

FWIW, it sounds like the Juno board would be a good candidate to be a
board to add testing modern U-Boot on, in kernelci.org.  Thanks!

-- 
Tom
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