Hi Lukas,
On Sat, Oct 20, 2018 at 6:09 AM Lukas Auer
<lukas.a...@aisec.fraunhofer.de> wrote:
>
> Add Kconfig entries for the C (compressed instructions) and A (atomic
> instructions) ISA extensions. Only the C ISA extension is selectable.
> This matches the configuration in Linux.
>
> The Kconfig entries are not used yet. A follow-up patch will select the
> appropriate compiler flags based on the Kconfig configuration.
>
> Signed-off-by: Lukas Auer <lukas.a...@aisec.fraunhofer.de>
> ---
>
> arch/riscv/Kconfig | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index b81e0d990a..e15329c35e 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -38,6 +38,15 @@ config ARCH_RV64I
>
> endchoice
>
> +config RISCV_ISA_C
> + bool "Emit compressed instructions"
> + default y
> + help
> + This enables the compressed instructions ("C") ISA extension.
This is a little bit confusing. Can we use Linux kernel's description
instead like below?
Adds "C" to the ISA subsets that the toolchain is allowed to emit
when building U-Boot, which results in compressed instructions in the
U-Boot binary.
> +
> +config RISCV_ISA_A
> + def_bool y
I do not believe U-Boot need to care about 'A' extension. So this can
be dropped?
> +
> config 32BIT
> bool
>
Regards,
Bin
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