From: Seung-Woo Kim <sw0312.kim@samsung.com>
Date: Fri, 14 Aug 2020 07:24:24 +0000 (+0900)
Subject: rpi4: boot: config: disable eeprom i2c hat auto detect
X-Git-Tag: accepted/tizen/unified/20210330.111217~50
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0dc36ce1fe0cfcaddd3f0f36401606f0bb3e54a8;p=platform%2Fkernel%2Flinux-rpi.git

rpi4: boot: config: disable eeprom i2c hat auto detect

From raspberry pi gpio pins, ID_SC and ID_SD are reserved by
firmware to detect HAT with i2c, but in Tizen, auto-detection
and dynamical setting dt with overlay is not supported.
To use the pins for uart2, explictly disable eeprom i2c hat
auto detect.

Ref: https://www.raspberrypi.org/documentation/configuration/config-txt/boot.md

Change-Id: Id5cf016b09e7661317529e1174842915165955bc
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
---

diff --git a/rpi4/boot/config.txt b/rpi4/boot/config.txt
index 6bdc59b..2a4fb5b 100644
--- a/rpi4/boot/config.txt
+++ b/rpi4/boot/config.txt
@@ -59,6 +59,10 @@ dtparam=audio=on
 # Enable DRM VC4 V3D driver on top of the dispmanx display stack
 dtoverlay=vc4-fkms-v3d
 max_framebuffers=2
+
+# Disable ID_SC and ID_SD pins to use UART2
+force_eeprom_read=0
+
 kernel=u-boot.bin
 
 [all]
diff --git a/rpi4/boot/config_64bit.txt b/rpi4/boot/config_64bit.txt
index ee241b1..d071525 100644
--- a/rpi4/boot/config_64bit.txt
+++ b/rpi4/boot/config_64bit.txt
@@ -59,6 +59,10 @@ dtparam=audio=on
 # Enable DRM VC4 V3D driver on top of the dispmanx display stack
 dtoverlay=vc4-fkms-v3d
 max_framebuffers=2
+
+# Disable ID_SC and ID_SD pins to use UART2
+force_eeprom_read=0
+
 kernel=u-boot.bin
 
 [all]