On Tue, 18 Jul 2023 12:02:48 +0200, Ahmad Fatoum wrote:
> Since commit 7e2f6a1ffd64 ("uimage: disable zero page when loading to
> SDRAM at address 0x0"), we allow locating images loaded from files at
> address zero if that's within the SDRAM. This only applied to images
> loaded with file_to_sdram() and images that were already in RAM were
> still not allowed to overlap the zero page.
>
> Fix this by doing in bootm_load_os() as was done in file_to_sdram(),
> namely, disabling zero page trapping for the duration of the memcpy.
> We need no further zero page handling afterwards, because kernel is
> booted after paging is disabled.
>
> Cc: Michael Tretter <m.tret...@pengutronix.de>
> Reported-by: Steffen Trumtrar <s.trumt...@pengutronix.de>
> Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
Reviewed-by: Michael Tretter <m.tret...@pengutronix.de>
> ---
> common/bootm.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/common/bootm.c b/common/bootm.c
> index 791d6b8fbbf1..4845c40958ae 100644
> --- a/common/bootm.c
> +++ b/common/bootm.c
> @@ -13,6 +13,7 @@
> #include <linux/stat.h>
> #include <magicvar.h>
> #include <uncompress.h>
> +#include <zero_page.h>
>
> static LIST_HEAD(handler_list);
>
> @@ -119,7 +120,7 @@ int bootm_load_os(struct image_data *data, unsigned long
> load_address)
> (unsigned long long)load_address + kernel_size
> - 1);
> return -ENOMEM;
> }
> - memcpy((void *)load_address, kernel, kernel_size);
> + zero_page_memcpy((void *)load_address, kernel, kernel_size);
> return 0;
> }
>
> --
> 2.39.2
>
>
