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. > > 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. -- Tom
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