[U-Boot] [PATCH v3 09/10] x86: Add a simple interrupt script to the README

[Simon Glass]

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>
---

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
-- 
2.5.0.rc2.392.g76e840b