mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-23 15:32:33 +00:00
52 lines
2.1 KiB
Diff
52 lines
2.1 KiB
Diff
|
From eadd32681787b1828ff92ef5046db6568d52ad55 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
||
|
|
Date: Tue, 29 May 2018 10:52:11 +0100
|
||
|
|
Subject: [PATCH 308/454] overlays: Add sdtweak features for network booting
|
||
|
|
|
||
|
|
It has been observed that a Pi with no SD card will poll the interface
|
||
|
|
continuously, using up to 10% CPU. Add some new parameters to the
|
||
|
|
sdtweak overlay to control this behaviour:
|
||
|
|
|
||
|
|
poll_once Only look for a card once, at boot time. If none is found
|
||
|
|
then the interface is effectively disabled.
|
||
|
|
|
||
|
|
enable Set to "off" or "no" to completely disable the interface.
|
||
|
|
|
||
|
|
See: https://github.com/raspberrypi/linux/issues/2567
|
||
|
|
|
||
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
|
||
|
|
---
|
||
|
|
arch/arm/boot/dts/overlays/README | 10 ++++++++++
|
||
|
|
arch/arm/boot/dts/overlays/sdtweak-overlay.dts | 2 ++
|
||
|
|
2 files changed, 12 insertions(+)
|
||
|
|
|
||
|
|
--- a/arch/arm/boot/dts/overlays/README
|
||
|
|
+++ b/arch/arm/boot/dts/overlays/README
|
||
|
|
@@ -1618,6 +1618,16 @@ Params: overclock_50 Clock (i
|
||
|
|
|
||
|
|
debug Enable debug output (default off)
|
||
|
|
|
||
|
|
+ poll_once Looks for a card once after booting. Useful
|
||
|
|
+ for network booting scenarios to avoid the
|
||
|
|
+ overhead of continuous polling. N.B. Using
|
||
|
|
+ this option restricts the system to using a
|
||
|
|
+ single card per boot (or none at all).
|
||
|
|
+ (default off)
|
||
|
|
+
|
||
|
|
+ enable Set to off to completely disable the interface
|
||
|
|
+ (default on)
|
||
|
|
+
|
||
|
|
|
||
|
|
Name: smi
|
||
|
|
Info: Enables the Secondary Memory Interface peripheral. Uses GPIOs 2-25!
|
||
|
|
--- a/arch/arm/boot/dts/overlays/sdtweak-overlay.dts
|
||
|
|
+++ b/arch/arm/boot/dts/overlays/sdtweak-overlay.dts
|
||
|
|
@@ -19,5 +19,7 @@
|
||
|
|
force_pio = <&frag0>,"brcm,force-pio?";
|
||
|
|
pio_limit = <&frag0>,"brcm,pio-limit:0";
|
||
|
|
debug = <&frag0>,"brcm,debug?";
|
||
|
|
+ enable = <&frag0>,"status";
|
||
|
|
+ poll_once = <&frag0>,"non-removable?";
|
||
|
|
};
|
||
|
|
};
|