From 60a2dd6aa20f6c0938856b764e7ebdee722d998e Mon Sep 17 00:00:00 2001
From: Patrick Delaunay <patrick.delaunay@st.com>
Date: Wed, 25 Nov 2020 12:28:10 +0100
Subject: [PATCH] board: st: stm32mp1: update load address for FIT examples

Update kernel load address for FIT examples to avoid relocation:
- Kernel example uses Image.gz with U-Boot gzip decompression
  at final kernel location 0x0xC0008000.
- Copro example loads zImage at a correct location (0xC4000000),
  to avoid zImage relocation before decompression by kernel code.

An other solution to avoid zImage relocation is to align
the kernel load and entry address with the real location in FIT
(the relocation of zImage is skipped in U-Boot bootm command for
identical address) but it is less flexible because this offset
depends on FIT content:

For example:

## Loading kernel from FIT Image at c2000000 ...
   Using 'ev1' configuration
   Trying 'kernel' kernel subimage
     Description:  Linux kernel
     Created:      2020-10-22   9:08:32 UTC
     Type:         Kernel Image
     Compression:  uncompressed
     Data Start:   0xc20000cc

The kernel offset in FIT is 0xCC in FIT and zImage is decompressed at
0xC0008000 by kernel code:

kernel {
	description = "Linux kernel";
	data = /incbin/("zImage");
	type = "kernel";
	arch = "arm";
	os = "linux";
	compression = "none";
	load = <0xC20000cc>;
	entry = <0xC20000cc>;
	hash-1 {
		algo = "sha1";
	};
};

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
---
 board/st/stm32mp1/fit_copro_kernel_dtb.its | 18 ++++++++++++++++--
 board/st/stm32mp1/fit_kernel_dtb.its       |  6 +++---
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/board/st/stm32mp1/fit_copro_kernel_dtb.its b/board/st/stm32mp1/fit_copro_kernel_dtb.its
index 3e08fd9..dc43639 100644
--- a/board/st/stm32mp1/fit_copro_kernel_dtb.its
+++ b/board/st/stm32mp1/fit_copro_kernel_dtb.its
@@ -1,6 +1,20 @@
 /*
  * Compilation:
  * mkimage -f fit_copro_kernel_dtb.its fit_copro_kernel_dtb.itb
+ *
+ * M4 firmware to load with remoteproc: rproc-m4-fw.elf
+ *
+ * Files in linux build dir:
+ * - arch/arm/boot/zImage
+ * - arch/arm/boot/dts/stm32mp157c-dk2.dtb
+ * - arch/arm/boot/dts/stm32mp157c-ev1.dtb
+ *
+ * load mmc 0:4 $kernel_addr_r fit_copro_kernel_dtb.itb
+ * bootm $kernel_addr_r
+ * bootm $kernel_addr_r#dk2
+ * bootm $kernel_addr_r#ev1
+ * bootm $kernel_addr_r#dk2-m4
+ * bootm $kernel_addr_r#ev1-m4
  */
 
 /dts-v1/;
@@ -29,8 +43,8 @@
 			arch = "arm";
 			os = "linux";
 			compression = "none";
-			load = <0xC0008000>;
-			entry = <0xC0008000>;
+			load = <0xC4000000>;
+			entry = <0xC4000000>;
 			hash-1 {
 				algo = "sha1";
 			};
diff --git a/board/st/stm32mp1/fit_kernel_dtb.its b/board/st/stm32mp1/fit_kernel_dtb.its
index 18d03eb..8456a3c 100644
--- a/board/st/stm32mp1/fit_kernel_dtb.its
+++ b/board/st/stm32mp1/fit_kernel_dtb.its
@@ -3,7 +3,7 @@
  * mkimage -f fit_kernel_dtb.its fit_kernel_dtb.itb
  *
  * Files in linux build dir:
- * - arch/arm/boot/zImage
+ * - arch/arm/boot/Image (gzipped in Image.gz)
  * - arch/arm/boot/dts/stm32mp157c-dk2.dtb
  * - arch/arm/boot/dts/stm32mp157c-ev1.dtb
  *
@@ -23,11 +23,11 @@
 	images {
 		kernel {
 			description = "Linux kernel";
-			data = /incbin/("zImage");
+			data = /incbin/("Image.gz");
 			type = "kernel";
 			arch = "arm";
 			os = "linux";
-			compression = "none";
+			compression = "gzip";
 			load = <0xC0008000>;
 			entry = <0xC0008000>;
 			hash-1 {
-- 
2.7.4