Re: [U-Boot] [PATCH v4 0/8] x86: qemu: add fw_cfg interface support for qemu-x86 targets

2016-01-03 Thread Bin Meng 
Hi Miao,

On Thu, Dec 31, 2015 at 10:55 AM, Miao Yan  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
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[U-Boot] [PATCH v4 0/8] x86: qemu: add fw_cfg interface support for qemu-x86 targets

2015-12-30 Thread Miao Yan 
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

-- 
1.9.1

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