[U-Boot] [PATCH v4 2/2] x86: Add a simple interrupt script to the README

[Bin Meng]

On Fri, Aug 14, 2015 at 12:36 AM, Simon Glass <sjg at chromium.org> wrote:
> It is a bit tedious to figure out the interrupt configuration for a new
> x86 platform. Add a script which can do this, based on the output of
> 'pci long'. This may be helpful in some cases.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>

Tested running the scripts with gawk 4.0.0
Tested-by: Bin Meng <bmeng.cn at gmail.com>

But please see comments below.

>
> Changes in v4:
> - Adjust the PCI device output to decimal instead of hex
>
> Changes in v3:
> - Add new patch to add a simple interrupt script to the README
>
> Changes in v2: None
>
>  doc/README.x86 | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/doc/README.x86 b/doc/README.x86
> index af2459c..b2ca108 100644
> --- a/doc/README.x86
> +++ b/doc/README.x86
> @@ -708,6 +708,21 @@ allocation and assignment will be done by U-Boot automatically. Now you can
>  enable CONFIG_GENERATE_PIRQ_TABLE for testing Linux kernel using i8259 PIC and
>  CONFIG_GENERATE_MP_TABLE for testing Linux kernel using local APIC and I/O APIC.
>
> +This script might be useful. If you feed it the output of 'pci long' from
> +U-Boot then it will generate a device tree fragment with the interrupt
> +configuration for each device:
> +
> +   $ cat console_output |awk '/PCI/ {device=$4} /interrupt line/ {line=$4} \
> +       /interrupt pin/ {pin = $4; if (pin != "0x00" && pin != "0xff") \
> +       {patsplit(device, bdf, "[0-9a-f]+"); \
> +       printf "PCI_BDF(%d, %d, %d) INT%c PIRQ%c\n", strtonum("0x" bdf[1]), \
> +       strtonum("0x" bdf[2]), bdf[3], strtonum(pin) + 64, 64 + strtonum(pin)}}'

Please mention the scripts require gawk 4.0.0 or newer version, as
patsplit is a new function introduced in 4.0.0. I compiled gawk from
the source and the scripts works.

> +
> +Example output:
> +   PCI_BDF(0, 2, 0) INTA PIRQA
> +   PCI_BDF(0, 3, 0) INTA PIRQA
> +...
> +
>  TODO List
>  ---------
>  - Audio
> --

Regards,
Bin