x86: Add a simple interrupt script to the README
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>
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@ -718,6 +718,21 @@ allocation and assignment will be done by U-Boot automatically. Now you can
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enable CONFIG_GENERATE_PIRQ_TABLE for testing Linux kernel using i8259 PIC and
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CONFIG_GENERATE_MP_TABLE for testing Linux kernel using local APIC and I/O APIC.
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This script might be useful. If you feed it the output of 'pci long' from
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U-Boot then it will generate a device tree fragment with the interrupt
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configuration for each device (note it needs gawk 4.0.0):
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$ cat console_output |awk '/PCI/ {device=$4} /interrupt line/ {line=$4} \
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/interrupt pin/ {pin = $4; if (pin != "0x00" && pin != "0xff") \
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{patsplit(device, bdf, "[0-9a-f]+"); \
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printf "PCI_BDF(%d, %d, %d) INT%c PIRQ%c\n", strtonum("0x" bdf[1]), \
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strtonum("0x" bdf[2]), bdf[3], strtonum(pin) + 64, 64 + strtonum(pin)}}'
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Example output:
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PCI_BDF(0, 2, 0) INTA PIRQA
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PCI_BDF(0, 3, 0) INTA PIRQA
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...
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TODO List
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---------
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- Audio
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