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x86: Add a simple interrupt script to the README

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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@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2015-08-13 10:36:17 -06:00
parent ef910819c5
commit 590870e7e8
1 changed files with 15 additions and 0 deletions
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15
doc/README.x86
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@ -718,6 +718,21 @@ 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 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. 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 (note it needs gawk 4.0.0):
$ 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)}}'
Example output:
PCI_BDF(0, 2, 0) INTA PIRQA
PCI_BDF(0, 3, 0) INTA PIRQA
...
TODO List TODO List
--------- ---------
- Audio - Audio