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

[Alexander Kurtz]

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.

The background is that ever since the upgrade to 4.14, the kernel has
been failing to unpack the initramfs, complaining about "junk in [the]
compressed archive" and I am currently trying to find where to best
file a bug report about this!

Best regards

Alexander Kurtz

[0] http://snapshot.debian.org/package/linux/4.13.13-1/#linux-image-4.13.0-1-arm64_4.13.13-1
[1] http://snapshot.debian.org/package/linux/4.14.17-1/#linux-image-4.14.0-3-arm64_4.14.17-1
[2] http://snapshot.debian.org/package/linux/4.15.4-1/#linux-image-4.15.0-1-arm64_4.15.4-1
[3] https://github.com/u-boot/u-boot/blob/master/doc/README.distro#L250
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