scripts/runqemu: fix qemumips qemumips64 memory detection kernel panic
$ runqemu qemumips64 core-image-minimal nographic qemuparams="-m 512"
...
[ 0.000000] Call Trace:
[ 0.000000] [<
ffffffff801268c0>] clear_page+0x0/0x128
[ 0.000000] [<
ffffffff80238158>] get_page_from_freelist+0xab8/0xc00
[ 0.000000] [<
ffffffff80238964>] __alloc_pages_nodemask+0xdc/0xf68
[ 0.000000] [<
ffffffff80239808>] __get_free_pages+0x18/0x70
[ 0.000000] [<
ffffffff80122a4c>] setup_zero_pages+0x1c/0xb8
[ 0.000000] [<
ffffffff80c7c998>] mem_init+0x54/0xa0
[ 0.000000] [<
ffffffff80c74904>] start_kernel+0x204/0x4d8
[ 0.000000] [<
ffffffff8091dfb0>] kernel_entry+0x0/0x40
[ 0.000000] Code:
02002025 1000f8d9 8e634d7c <
34860f80>
cc9e0000
cc9e0020 cc9e0040 cc9e0060 cc9e0080
[ 0.000000]
[ 0.000000] ---[ end trace
0000000000000000 ]---
[ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
[ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task!
...
OE uses qemumips to simulate a Malta board by default.
As upstream qemu introduced:
https://git.qemu.org/?p=qemu.git;a=commit;h=
94c2b6aff43cdfcfdfb552773a6b6b973a72ef0b
The Malta board can support up to 2GiB of RAM which should
be able to boot a Linux kernel built with CONFIG_HIGHMEM
enabled and passing "-m 2048" to QEMU and appending the
following kernel parameters:
...
mem=256M@0x0 mem=256M@0x90000000 mem=1536M@0x20000000
...
But the following commit in kernel broke above mem=X@Y setting
which added the memory as reserved memory area.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=
73fbc1eba7ffa3bf0ad12486232a8a1edb4e4411
...
commit
73fbc1eba7ffa3bf0ad12486232a8a1edb4e4411
Author: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Date: Wed Nov 23 14:43:49 2016 +0100
MIPS: fix mem=X@Y commandline processing
...
So remove `mem=*' to disable user-defined physical RAM map
which let kernel itself caculates memory ranges.
Author: Hongxu Jia <hongxu.jia@windriver.com>
[ Merge the two fixes for qemumips32 and qemumips64 into one patch,
and make it support all mips cases ]
Signed-off-by: He Zhe <zhe.he@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
