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| author | Takao Indoh <indou.takao@jp.fujitsu.com> | 2011-07-14 18:05:21 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2011-07-16 18:40:16 -0400 |
| commit | 4996c02306a25def1d352ec8e8f48895bbc7dea9 (patch) | |
| tree | 924944ad2dc7fd456e6ce6c097e552bfebacabf6 /Documentation/kernel-parameters.txt | |
| parent | 1765a367a3b5d5e9692949b0c5ec933eff2c0701 (diff) | |
| download | linux-rt-4996c02306a25def1d352ec8e8f48895bbc7dea9.tar.gz | |
ACPI: introduce "acpi_rsdp=" parameter for kdump
There is a problem with putting the first kernel in EFI virtual mode,
it is that when the second kernel comes up it tries to initialize the
EFI again and once we have put EFI in virtual mode we can not really
do that.
Actually, EFI is not necessary for kdump, we can boot the second kernel
with "noefi" parameter, but the boot will mostly fail because 2nd kernel
cannot find RSDP.
In this situation, we introduced "acpi_rsdp=" kernel parameter, so that
kexec-tools can pass the "noefi acpi_rsdp=X" to the second kernel to
make kdump works. The physical address of the RSDP can be got from
sysfs(/sys/firmware/efi/systab).
Signed-off-by: Takao Indoh <indou.takao@jp.fujitsu.com>
Reviewed-by: WANG Cong <amwang@redhat.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index aa47be71df4c..37713bcf7778 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -163,6 +163,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted. See also Documentation/power/pm.txt, pci=noacpi + acpi_rsdp= [ACPI,EFI,KEXEC] + Pass the RSDP address to the kernel, mostly used + on machines running EFI runtime service to boot the + second kernel for kdump. + acpi_apic_instance= [ACPI, IOAPIC] Format: <int> 2: use 2nd APIC table, if available |