[Buildroot] Xtensa qemu nommu defconfig not working

[Thomas Petazzoni]

Hello,

The configs/qemu_xtensa_lx60_nommu_defconfig builds correctly, but
fails to boot under Qemu:

[    1.158675] Freeing unused kernel image (initmem) memory: 460K
[    1.159475] This architecture does not have kernel memory protection.
[    1.160806] Run /init as init process
[    1.186746] binfmt_flat: reloc outside program 0x24c80100 (0 - 0x6e430/0x56a20), killing init!
[    1.190881] Failed to execute /init (error -8)
[    1.191529] Run /sbin/init as init process
[    1.204778] binfmt_flat: reloc outside program 0x24c80100 (0 - 0x6e430/0x56a20), killing init!
[    1.206216] Starting init: /sbin/init exists but couldn't execute it (error -8)
[    1.207229] Run /etc/init as init process
[    1.209332] Run /bin/init as init process
[    1.210517] Run /bin/sh as init process
[    1.220290] binfmt_flat: reloc outside program 0x24c80100 (0 - 0x6e430/0x56a20), killing sh!
[    1.221658] Starting init: /bin/sh exists but couldn't execute it (error -8)
[    1.223403] Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance.
[    1.226218] ---[ end Kernel panic - not syncing: No working init found.  Try passing init= option to kernel. See Linux Documentation/admin-guide/init.rst for guidance. ]---

There were some changes in elf2flt:

9dd179d43ffe9be98035f921a0db2bf051b632fb package/elf2flt: fix fatal error regression on m68k, xtensa, riscv64
95402089c314fbc03b934f5fcf9c29db043d758c package/elf2flt: remove broken patch
b07210b272c6e8810b038190cf5c1fd1f7b48397 package/gcc: remove BR2_GCC_ENABLE_LTO
9db5eb258cf492567bac33a33cb606f14045639d package/elf2flt: Remove Config.in.host
3e50b5fe2632a3081fd3f6574a5e9525fa897fdb package/elf2flt: update AUTORECONF comment
32f93b0ef2c602dfa1f5b243ba865d5b16e2fa33 package/elf2flt: update RISC-V 64-bits support
65d78dcfeb8b2eafaebe2d0c3c8c42e7e85f46ac package/elf2flt: update to version 2021.08
6d49446ebdbd32c1b4591c0aa8cacb189a69e318 package/elf2flt: add RISC-V 64-bits support

However, in commit 9dd179d43ffe9be98035f921a0db2bf051b632fb, Niklas
said about the qemu_xtensa_lx60_nommu_defconfig configuration: "xtensa
crashes when loading init, the same behavior as when reverting the bad
upstream elf2flt commit completely."

Max, do you think you could have a look at what is happening?

Best regards,

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com