[PATCH] stm32mp1: remove fdt_high and initrd_high in environment

Patrick Delaunay patrick.delaunay at st.com
Mon Feb 10 11:54:11 CET 2020

Remove fdt_high and initrd_high (set to 0xffffffff) in stm32mp1 board
enviromnent, and U-Boot always relocate FDT and initrd in bootm command.

This relocation is limited by CONFIG_SYS_BOOTMAPSZ which indicates
the size of the memory region where it is safe to place data passed
to the Linux kernel (DTB, initrd), it is
a) Less than or equal to RAM size.
b) not within the kernel's highmem region

So 256M seems large enough in most circumstances and users
can override this value via environment variable "bootm_mapsize"
if needed.

This modification increases the boot time but avoid assumption
on aligned address for bootm command.

A user can still define this variables themselves if the FDT or
initrd is either left in-place or copied to a specific location.

Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>

 include/configs/stm32mp1.h | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/include/configs/stm32mp1.h b/include/configs/stm32mp1.h
index a66534e027..42717c167e 100644
--- a/include/configs/stm32mp1.h
+++ b/include/configs/stm32mp1.h
@@ -43,8 +43,14 @@
+ * For booting Linux, use the first 256 MB of memory, since this is
+ * the maximum mapped by the Linux kernel during initialization.
+ */
 /* Extend size of kernel image for uncompression */
 /* SPL support */
 #ifdef CONFIG_SPL
@@ -215,8 +221,6 @@
 	"pxefile_addr_r=0xc4200000\0" \
 	"splashimage=0xc4300000\0"  \
 	"ramdisk_addr_r=0xc4400000\0" \
-	"fdt_high=0xffffffff\0" \
-	"initrd_high=0xffffffff\0" \
 	"altbootcmd=run bootcmd\0" \
 	"env_default=1\0" \
 	"env_check=if test $env_default -eq 1;"\

More information about the U-Boot mailing list