[U-Boot] Support of kernels > 16 MiB on Raspberry Pi

[Tom Rini]

On Fri, Feb 23, 2018 at 04:47:06PM +0900, Jaehoon Chung wrote:
> On 02/23/2018 04:58 AM, Alexander Kurtz wrote:
> > Hi!
> > 
> > I am using U-Boot to boot Debian Buster arm64 (standard kernel with a
> > dracut-based initramfs) via an extlinux.conf on my Raspberry Pi 3. 
> > 
> > Recently, the Debian kernel grew beyond 16 MiB:
> > 
> >     4.13: /boot/vmlinuz-4.13.0-1-arm64 == 16448000 bytes (< 16 MiB) [0]
> >     4.14: /boot/vmlinuz-4.14.0-3-arm64 == 17539584 bytes (> 16 MiB) [1]
> >     4.15: /boot/vmlinuz-4.15.0-1-arm64 == 17867264 bytes (> 16 MiB) [2]
> > 
> > https://github.com/u-boot/u-boot/blob/master/include/configs/rpi.h#L129 says:
> > 
> >     #define ENV_MEM_LAYOUT_SETTINGS \
> >     "fdt_high=ffffffff\0" \
> >     "initrd_high=ffffffff\0" \
> >     "fdt_addr_r=0x00000100\0" \
> >     "pxefile_addr_r=0x00100000\0" \
> >     "kernel_addr_r=0x01000000\0" \
> >     "scriptaddr=0x02000000\0" \
> >     "ramdisk_addr_r=0x02100000\0" \
> > 
> > Am I correct in assuming that this default configuration will break
> > with kernels > 16 MiB? The Readme [3] seems to confirm this, but I
> > wanted to ask for explicit confirmation here.
> 
> Especially, this is occurred about arm64 kernel.
> Because it wil be overlapped with other image address, if kernel image is over than 16MB.
> 
> In my case, i'm using the private boot.scr.img for booting script.
> I had just added the kernel_addr_r=0x02d000000.
> 
> Just Refer to below:
> https://review.tizen.org/git/?p=platform/kernel/u-boot.git;a=commit;h=8fdfbbeb8a4b2f8c8e66824709e48d9abdb23534

I would strongly recommend setting the values here based on what
linux/Documentation/arm/Booting and linux/Documentation/arm64/boot.txt
describe as the maximum limits for each of these locations.  And take a
peek at include/configs/ti_armv7_common.h in U-Boot on how I set these
for the various TI platforms.

-- 
Tom
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