BUG: as of 2967e24d0 "ramips: switch to Linux 6.6' ERX kernel is too big

[Robert Marko]

On Mon, 20 May 2024 at 03:50, Russell Senior <russell at personaltelco.net> wrote:
>
> (try#2, damn you gmail)
>
> I mentioned this on IRC and as a github comment on the commit
> (https://github.com/openwrt/openwrt/commit/2967e24d02775f63d9e363e6e0d351716dcc3f7c)
>
> My build started failing on the commit. The message I get from the
> build system is:
>
>   "WARNING: Image file
> /home/openwrt/src/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/ubnt_edgerouter-x-kernel.bin
> is too big: 3165615 > 3145728"
>
> I tried a vanilla config:
>
>   CONFIG_TARGET_ramips=y
>   CONFIG_TARGET_ramips_mt7621=y
>   CONFIG_TARGET_ramips_mt7621_DEVICE_ubnt_edgerouter-x=y
>   CONFIG_DEVEL=y
>   CONFIG_BUILD_LOG=y
>
>   "WARNING: Image file
> /home/openwrt/src/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/ubnt_edgerouter-x-kernel.bin
> is too big: 3165361 > 3145728"
>
> I notice that there are two kernel partitions on the NAND flash, each
> of which is 3MB:
>
> [    1.011604] 6 fixed-partitions partitions found on MTD device mt7621-nand
> [    1.025136] Creating 6 MTD partitions on "mt7621-nand":
> [    1.035552] 0x000000000000-0x000000080000 : "u-boot"
> [    1.054525] 0x000000080000-0x0000000e0000 : "u-boot-env"
> [    1.072180] 0x0000000e0000-0x000000140000 : "factory"
> [    1.089606] 0x000000140000-0x000000440000 : "kernel1"
> [    1.147424] 0x000000440000-0x000000740000 : "kernel2"
> [    1.204979] 0x000000740000-0x00000ff00000 : "ubi"
>
> Which suggests two possible fixes:
>
>  a) cannibalize the second kernel parition (might require a different
> u-boot?); or
>
>  b) use an intermediate u-boot that looks for the kernel in a ubi partition.
>
> or
>
>  c) make the damn kernel smaller.
>
> Thoughts?

Take a look at:
https://github.com/openwrt/openwrt/pull/15194

Regards,
Robert
>
> --
> Russell Senior
> russell at personaltelco.net
>
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