From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tom Rini Date: Tue, 8 Nov 2016 12:51:44 -0500 Subject: [U-Boot] U-Boot overlaps BSS and initrd on arm64 In-Reply-To: References: Message-ID: <20161108175144.GC6637@bill-the-cat> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 819 bytes Desc: Digital signature URL: