Hi,
On 04/07/2016 11:33, Gerd Hoffmann wrote:
> From: "Richard W.M. Jones" <rjo...@redhat.com>
>
> This commit adds a fast variant of SeaBIOS called 'bios-fast.bin'.
>
> It's designed to be the fastest (also the smallest, but that's not the
> main aim) SeaBIOS that is just enough to boot a Linux kernel using the
> -kernel option on i686 and x86_64.
>
> This commit does not modify the -kernel option to use this. You have
> to specify it by doing something like this:
>
> -kernel vmlinuz -bios bios-fast.bin
I like the idea: I'm wondering if we should do the same thing for ppc64?
In fact, it is already done, if you have kvm-unit-tests, you can do:
qemu-system-ppc64 ... -kernel vmlinuz \
-initrd initramfs.img \
-append .... \
-bios .../kvm-unit-tests/powerpc/boot_rom.bin
and boot_rom.bin is (thanks to the power of device-tree):
#define SPAPR_KERNEL_LOAD_ADDR 0x400000
.text
.globl start
start:
b SPAPR_KERNEL_LOAD_ADDR - 0x100
It can't be faster...
The question is: should we add this binary to qemu?
And it can open new doors: booting with petitboot instead of SLOF.
Laurent
