From 590870e7e8919bca7adfd97069ac5b2a924b3151 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Thu, 13 Aug 2015 10:36:17 -0600
Subject: [PATCH] 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>
---
doc/README.x86 | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/doc/README.x86 b/doc/README.x86
index 9012541cad7..e7dc090e76b 100644
--- a/doc/README.x86
+++ b/doc/README.x86
@@ -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
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
---------
- Audio
--
GitLab