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 ---
Changes in v3: - Add new patch to add a simple interrupt script to the README
Changes in v2: None
doc/README.x86 | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/doc/README.x86 b/doc/README.x86 index af2459c..1e8be8f 100644 --- a/doc/README.x86 +++ b/doc/README.x86 @@ -708,6 +708,20 @@ 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") \ + {printf "PCI_BDF(%s) INT%c PIRQ%c\n", device, strtonum(pin) + 64, 64 + \ + strtonum(pin)}}' | sed 's/(..).(..).(..):/0x\1, 0x\2, 0x\3/' + +Example output: + PCI_BDF(0x00, 0x02, 0x00) INTA PIRQA + PCI_BDF(0x00, 0x11, 0x00) INTA PIRQA +... + TODO List --------- - Audio