On 6/6/20 7:15 PM, Ard Biesheuvel wrote:
> Add an override for enable_caches to enable the I and D caches, along
> with the cached 1:1 mapping of all of DRAM. This is needed for running
> U-Boot under virtualization with QEMU/kvm.
>
> Signed-off-by: Ard Biesheuvel <a...@kernel.org>
> ---
> board/emulation/qemu-arm/qemu-arm.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/board/emulation/qemu-arm/qemu-arm.c
> b/board/emulation/qemu-arm/qemu-arm.c
> index 69e8ef46f1f5..1b0d543b93c1 100644
> --- a/board/emulation/qemu-arm/qemu-arm.c
> +++ b/board/emulation/qemu-arm/qemu-arm.c
> @@ -4,6 +4,7 @@
> */
>
> #include <common.h>
> +#include <cpu_func.h>
> #include <dm.h>
> #include <fdtdec.h>
> #include <init.h>
> @@ -94,6 +95,12 @@ void *board_fdt_blob_setup(void)
> return (void *)CONFIG_SYS_SDRAM_BASE;
> }
>
> +void enable_caches(void)
> +{
> + icache_enable();
> + dcache_enable();
> +}
> +
For other ARM architectures I have seen:
int arch_cpu_init(void)
{
icache_enable();
return 0;
}
void enable_caches(void)
{
dcache_enable();
}
Some boards have
if (!icache_status())
icache_enable();
others
#if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
icache_enable();
#endif
Tom could you, please, advice what is the correct way to do it.
Best regards
Heinrich
> #if defined(CONFIG_EFI_RNG_PROTOCOL)
> #include <efi_loader.h>
> #include <efi_rng.h>
>
