Hi Simon,
On Sat, Jul 18, 2015 at 10:37 PM, Simon Glass sjg@chromium.org wrote:
Hi Bin,
On 15 July 2015 at 02:23, Bin Meng bmeng.cn@gmail.com wrote:
The existing MP initialization process works on QEMU multicore, except that we need increase delay time for BSP to wait APs to show up online. Use a Kconfig option to control the delay time factor to the normal one.
Signed-off-by: Bin Meng bmeng.cn@gmail.com
arch/x86/cpu/mp_init.c | 4 ++++ arch/x86/cpu/qemu/Kconfig | 11 +++++++++++ arch/x86/dts/qemu-x86_i440fx.dts | 20 ++++++++++++++++++++ arch/x86/dts/qemu-x86_q35.dts | 20 ++++++++++++++++++++ configs/qemu-x86_defconfig | 4 ++++ doc/README.x86 | 5 +++++ 6 files changed, 64 insertions(+)
Why does qemu need a longer delay? Can we put this in as a property of the /cpus node instead?
I have no idea. I suspect it is caused by QEMU's multicore simulation is not real paralleled. Yep, we can define a parameter in the /cpus node to control this.
Regards, Bin