Hi Miao, On Thu, Dec 31, 2015 at 10:55 AM, Miao Yan <yanmiaob...@gmail.com> wrote: > The fw_cfg interface provided by QEMU allow guests to retrieve various > information > about the system, e.g. cpu number, variaous firmware data, kernel setup, etc. > The > fw_cfg interface can be accessed through 3 IO ports (on x86), using x86 in/out > instructions. > > - 0x510: select configuration items to access > - 0x511: reading this port will return data selected in 0x510 > - 0x514: this can be used to detect if DMA interface is available > > If fw_cfg DMA interface is available, it can be used to accelerate > accesses. > > This patchset adds the following supports for qemu-x86 targets: > > + the fw_cfg driver itself > > + add a U-Boot command 'fw' to support direct accessing kernel informtion > from fw_cfg interface, this saves the time of loading them from hard disk > or > network again, through emulated devices. > > + use fw_cfg to get cpu number at runtime, so smp boot no longer relies on > the cpu node hard-coded in dts files. > > Changes in v4: > - drop [PATCH v3 7/8] and limit maximum supported cpu number > - chance 'fw load' to take second parameter for initrd load address > - change default initrd load address for qemu-x86 > > Miao Yan (8): > x86: qemu: add fw_cfg support > x86: qemu: add a cpu uclass driver for qemu target > x86: fix a typo in function name > x86: use actual CPU number for allocating memory > x86: qemu: add qemu_fwcfg_fdt_fixup() > x86: qemu: fix up cpu node in device tree > x86: qemu: adjust ramdisk load address > x86: qemu: add documentaion for the fw_cfg interface > > arch/x86/cpu/mp_init.c | 12 +- > arch/x86/cpu/qemu/Makefile | 2 +- > arch/x86/cpu/qemu/cpu.c | 57 +++++++ > arch/x86/cpu/qemu/fw_cfg.c | 333 > +++++++++++++++++++++++++++++++++++++++ > arch/x86/cpu/qemu/fw_cfg.h | 108 +++++++++++++ > arch/x86/cpu/qemu/qemu.c | 7 + > arch/x86/dts/qemu-x86_i440fx.dts | 19 +-- > arch/x86/dts/qemu-x86_q35.dts | 19 +-- > doc/README.x86 | 35 +++- > include/configs/qemu-x86.h | 13 ++ > 10 files changed, 559 insertions(+), 46 deletions(-) > create mode 100644 arch/x86/cpu/qemu/cpu.c > create mode 100644 arch/x86/cpu/qemu/fw_cfg.c > create mode 100644 arch/x86/cpu/qemu/fw_cfg.h > > --
Please add those git tags (eg: Reviewed-by, Tested-By, Acked-by) when you rework your patch series. This helps future reviews of the same patch series. Regards, Bin _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
