On 2021/8/3 5:30, Tom Rini wrote:
On Mon, Aug 02, 2021 at 06:44:57PM +0800, Chia-Wei Wang wrote:
A U-Boot image could be loaded and executed at a different
location than it was linked at.
For example, Aspeed takes a stable release version of U-Boot image
as the golden one for recovery purposes. When the primary storage
such as flash is corrupted, the golden image could be loaded to any
SRAM/DRAM address on demands through ethernet/UART/etc.
How? When flash got corrupted, how do you manage to load the golden image?
To deal with this condition, the PIE is needed as there is only one
signed, golden image, which could be however executed at different
places.
This patch adds the PIE support for ARMv7 platform.
Signed-off-by: Chia-Wei Wang <chiawei_w...@aspeedtech.com>
---
arch/arm/Kconfig | 4 +++-
arch/arm/cpu/armv7/start.S | 43 ++++++++++++++++++++++++++++++++++++++
arch/arm/lib/crt0.S | 11 ++++++++++
arch/arm/lib/relocate.S | 35 ++++++++++++++++++++++---------
4 files changed, 82 insertions(+), 11 deletions(-)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 2b7b625705..45879c9f06 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -9,7 +9,7 @@ config ARM64
select PHYS_64BIT
select SYS_CACHE_SHIFT_6
-if ARM64
+if ARM64 || CPU_V7A
config POSITION_INDEPENDENT
bool "Generate position-independent pre-relocation code"
help
Thanks for doing this. I think we need to fix the depends on lines here
rather than hide with if ARM64 || CPU_V7A, and then fix anything else
that follows to also have the correct dependencies.
