2016-07-07 07:22:07 +00:00
|
|
|
From cef80f622db0010b80505bb5ffe200918e1c5cdb Mon Sep 17 00:00:00 2001
|
2016-04-07 19:25:10 +00:00
|
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
|
|
|
Date: Wed, 30 Mar 2016 17:07:15 +0100
|
2016-07-07 07:22:07 +00:00
|
|
|
Subject: [PATCH 217/423] BCM270X_DT: Document hazards of sdhost overlay
|
2016-04-07 19:25:10 +00:00
|
|
|
|
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
|
|
|
|
|
---
|
|
|
|
|
arch/arm/boot/dts/overlays/README | 8 +++++++-
|
|
|
|
|
1 file changed, 7 insertions(+), 1 deletion(-)
|
|
|
|
|
|
|
|
|
|
--- a/arch/arm/boot/dts/overlays/README
|
|
|
|
|
+++ b/arch/arm/boot/dts/overlays/README
|
|
|
|
|
@@ -712,7 +712,11 @@ Params: <None>
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Name: sdhost
|
|
|
|
|
-Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock
|
|
|
|
|
+Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock.
|
|
|
|
|
+ N.B. This overlay is designed for situations where the mmc driver is
|
|
|
|
|
+ the default, so it disables the other (mmc) interface - this will kill
|
|
|
|
|
+ WiFi on a Pi3. If this isn't what you want, either use the sdtweak
|
|
|
|
|
+ overlay or the new sd_* dtparams of the base DTBs.
|
|
|
|
|
Load: dtoverlay=sdhost,<param>=<val>
|
|
|
|
|
Params: overclock_50 Clock (in MHz) to use when the MMC framework
|
|
|
|
|
requests 50MHz
|
|
|
|
|
@@ -771,6 +775,8 @@ Params: overclock_50 SD Clock
|
|
|
|
|
|
|
|
|
|
Name: sdtweak
|
|
|
|
|
Info: Tunes the bcm2835-sdhost SD/MMC driver
|
|
|
|
|
+ N.B. This functionality is now available via the sd_* dtparams in the
|
|
|
|
|
+ base DTB.
|
|
|
|
|
Load: dtoverlay=sdtweak,<param>=<val>
|
|
|
|
|
Params: overclock_50 Clock (in MHz) to use when the MMC framework
|
|
|
|
|
requests 50MHz
|
