From 06d1dd2cdc3c69122e58b38fd11b2a4e524a37e2 Mon Sep 17 00:00:00 2001
From: Patrick Delaunay <patrick.delaunay@st.com>
Date: Fri, 2 Aug 2019 15:07:22 +0200
Subject: [PATCH] stm32mp1: update README for remoteproc support
Add information for remoteproc usage to load firmware in M4 coprocessor
on stm32mp157.
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
---
board/st/stm32mp1/README | 36 ++++++++++++++++++++++++++++++++++--
1 file changed, 34 insertions(+), 2 deletions(-)
diff --git a/board/st/stm32mp1/README b/board/st/stm32mp1/README
index 428357cfa0..c807e0842e 100644
--- a/board/st/stm32mp1/README
+++ b/board/st/stm32mp1/README
@@ -139,7 +139,6 @@ the supported device trees for stm32mp157 are:
# make DEVICE_TREE=<name> all
-
example:
a) trusted boot on ev1
# export KBUILD_OUTPUT=stm32mp15_trusted
@@ -190,7 +189,7 @@ the supported device trees for stm32mp157 are:
6. Switch Setting for Boot Mode
===============================
-You can select the boot mode, on the board ed1 with the switch SW1
+You can select the boot mode, on the board with one switch :
- on the daugther board ed1 with the switch SW1 : BOOT0, BOOT1, BOOT2
@@ -358,3 +357,36 @@ on bank 0 to access to internal OTP:
4 check env update
STM32MP> print ethaddr
ethaddr=12:34:56:78:9a:bc
+
+10. Coprocessor firmware
+========================
+
+U-Boot can boot the coprocessor before the kernel (coprocessor early boot).
+
+A/ Manuallly by using rproc commands (update the bootcmd)
+ Configurations
+ # env set name_copro "rproc-m4-fw.elf"
+ # env set dev_copro 0
+ # env set loadaddr_copro 0xC1000000
+
+ Load binary from bootfs partition (number 4) on SDCard (mmc 0)
+ # ext4load mmc 0:4 ${loadaddr_copro} ${name_copro}
+ => ${filesize} updated with the size of the loaded file
+
+ Start M4 firmware with remote proc command
+ # rproc init
+ # rproc load ${dev_copro} ${loadaddr_copro} ${filesize}
+ # rproc start ${dev_copro}
+
+B/ Automatically by using FIT feature and generic DISTRO bootcmd
+
+ see examples in this directory :
+
+ Generate FIT including kernel + device tree + M4 firmware
+ with cfg with M4 boot
+ $> mkimage -f fit_copro_kernel_dtb.its fit_copro_kernel_dtb.itb
+
+ Then using DISTRO configuration file: see extlinux.conf to select
+ the correct configuration
+ => stm32mp157c-ev1-m4
+ => stm32mp157c-dk2-m4
--
2.39.5