Add a cpu1 node to the device tree and enable the MP initialization on QEMU targets (i440fx and q35).
Signed-off-by: Bin Meng bmeng.cn@gmail.com ---
arch/x86/dts/qemu-x86_i440fx.dts | 7 +++++++ arch/x86/dts/qemu-x86_q35.dts | 7 +++++++ configs/qemu-x86_defconfig | 2 ++ doc/README.x86 | 5 +++++ 4 files changed, 21 insertions(+)
diff --git a/arch/x86/dts/qemu-x86_i440fx.dts b/arch/x86/dts/qemu-x86_i440fx.dts index c26c71b..fc74cd0 100644 --- a/arch/x86/dts/qemu-x86_i440fx.dts +++ b/arch/x86/dts/qemu-x86_i440fx.dts @@ -34,6 +34,13 @@ reg = <0>; intel,apic-id = <0>; }; + + cpu@1 { + device_type = "cpu"; + compatible = "cpu-x86"; + reg = <1>; + intel,apic-id = <1>; + }; };
pci { diff --git a/arch/x86/dts/qemu-x86_q35.dts b/arch/x86/dts/qemu-x86_q35.dts index 2e785fa..7f16971 100644 --- a/arch/x86/dts/qemu-x86_q35.dts +++ b/arch/x86/dts/qemu-x86_q35.dts @@ -45,6 +45,13 @@ reg = <0>; intel,apic-id = <0>; }; + + cpu@1 { + device_type = "cpu"; + compatible = "cpu-x86"; + reg = <1>; + intel,apic-id = <1>; + }; };
pci { diff --git a/configs/qemu-x86_defconfig b/configs/qemu-x86_defconfig index 4b18d51..e579c36 100644 --- a/configs/qemu-x86_defconfig +++ b/configs/qemu-x86_defconfig @@ -1,5 +1,7 @@ CONFIG_X86=y CONFIG_DEFAULT_DEVICE_TREE="qemu-x86_i440fx" +CONFIG_SMP=y +CONFIG_MAX_CPUS=2 CONFIG_GENERATE_PIRQ_TABLE=y CONFIG_GENERATE_MP_TABLE=y CONFIG_CMD_CPU=y diff --git a/doc/README.x86 b/doc/README.x86 index 5d71244..1cab42c 100644 --- a/doc/README.x86 +++ b/doc/README.x86 @@ -281,6 +281,11 @@ QEMU emulates a graphic card which U-Boot supports. Removing '-nographic' will show QEMU's VGA console window. Note this will disable QEMU's serial output. If you want to check both consoles, use '-serial stdio'.
+Multicore is also supported by QEMU via '-smp n' where n is the number of cores +to instantiate. Currently the default U-Boot built for QEMU supports 2 cores. +In order to support more cores, you need add additional cpu nodes in the device +tree and change CONFIG_MAX_CPUS accordingly. + CPU Microcode ------------- Modern CPUs usually require a special bit stream called microcode [8] to be