Hi,
Following patch regresses Linux boot on PReP machine:
commit a2e71b28e832346409efc795ecd1f0a2bcb705a3
Author: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Date: Tue Jun 21 23:48:46 2016 +0200
ppc: Fix rfi/rfid/hrfi/... emulation
This reworks emulation of the various "rfi" variants. I removed
some masking bits that I couldn't make sense of, the only bit that
I am aware we should mask here is POW, the CPU's MSR mask should
take care of the rest.
This also fixes some problems when running 32-bit userspace under
a 64-bit kernel.
This patch broke 32bit OpenBIOS when run under a 970 cpu. A fix was
proposed here :
https://www.coreboot.org/pipermail/openbios/2016-June/009452.html
Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Reviewed-by: David Gibson <da...@gibson.dropbear.id.au>
[clg: updated the commit log with the reference of the openbios fix ]
Signed-off-by: Cédric Le Goater <c...@kaod.org>
[dwg: Remove hunk which disabled rfi on 64-bit CPUS. The change was
correct, but we need to fix OpenBIOS before applying it]
Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
Test case:
- Download: http://www.juneau-lug.org/zImage.initrd.sandalfoot
- Run: qemu-system-ppc -M prep -kernel zImage.initrd.sandalfoot
Firmware starts, loads kernel, but seems to error out just after PS/2 detection.
Reverting the commit and fixing the conflict makes it work again, up to shell.
Hervé
