20.03.2020 17:43, Geert Uytterhoeven пишет:
> Currently, the start address of physical memory is obtained by masking
> the program counter with a fixed mask of 0xf8000000. This mask value
> was chosen as a balance between the requirements of different platforms.
> However, this does require that the start address of physical memory is
> a multiple of 128 MiB, precluding booting Linux on platforms where this
> requirement is not fulfilled.
>
> Fix this limitation by obtaining the start address from the DTB instead,
> if available (either explicitly passed, or appended to the kernel).
> Fall back to the traditional method when needed.
>
> This allows to boot Linux on r7s9210/rza2mevb using the 64 MiB of SDRAM
> on the RZA2MEVB sub board, which is located at 0x0C000000 (CS3 space),
> i.e. not at a multiple of 128 MiB.
>
> Suggested-by: Nicolas Pitre <nico@xxxxxxxxxxx>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> Reviewed-by: Nicolas Pitre <nico@xxxxxxxxxxx>
> Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> ---
> v4:
> - Fix stack location after commit 184bf653a7a452c1 ("ARM:
> decompressor: factor out routine to obtain the inflated image
> size"),
>
> v3:
> - Add Reviewed-by,
> - Fix ATAGs with appended DTB,
> - Add Tested-by,
>
> v2:
> - Use "cmp r0, #-1", instead of "cmn r0, #1",
> - Add missing stack setup,
> - Support appended DTB.
> ---
> arch/arm/boot/compressed/Makefile | 6 ++-
> arch/arm/boot/compressed/fdt_get_mem_start.c | 52 +++++++++++++++++++
> arch/arm/boot/compressed/head.S | 54 +++++++++++++++++++-
> 3 files changed, 110 insertions(+), 2 deletions(-)
> create mode 100644 arch/arm/boot/compressed/fdt_get_mem_start.c
Thank you very much! It works!
Tested-by: Dmitry Osipenko <digetx@xxxxxxxxx>
