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SubjectRe: [PATCH] riscv: Disallow to build XIP_KERNEL with SOC_SIFIVE
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Le 4/29/21 à 5:11 AM, Vitaly Wool a écrit :
> On Thu, Apr 29, 2021 at 10:47 AM Alexandre Ghiti <alex@ghiti.fr> wrote:
>>
>> RISCV_ERRATA_ALTERNATIVE patches text at runtime which is not possible when
>> the kernel is executed from the flash in XIP mode, and as the SIFIVE
>> errata must be fixed somehow, disallow to build a XIP kernel that
>> supports SIFIVE socs.
>
> Could you please hold off this patch for a bit? I will try to come up
> with an alternative solution. It should be possible to define a
> special section within the RW area and place the functions that need
> such patching there.
> Not that I like that much but at least we'll keep the ability to use
> XIP on SiFive.

Ok, I'm wondering why I did not think of that...I'll give it a try just
to punish myself.

Thanks Vitaly,

Alex

>
> Best regards,
> Vitaly
>
>> Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
>> ---
>> arch/riscv/Kconfig.erratas | 2 +-
>> arch/riscv/Kconfig.socs | 1 +
>> 2 files changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/riscv/Kconfig.erratas b/arch/riscv/Kconfig.erratas
>> index d5d03ae8d685..9537dbd67357 100644
>> --- a/arch/riscv/Kconfig.erratas
>> +++ b/arch/riscv/Kconfig.erratas
>> @@ -2,7 +2,7 @@ menu "CPU errata selection"
>>
>> config RISCV_ERRATA_ALTERNATIVE
>> bool "RISC-V alternative scheme"
>> - default y
>> + default y if !XIP_KERNEL
>> help
>> This Kconfig allows the kernel to automatically patch the
>> errata required by the execution platform at run time. The
>> diff --git a/arch/riscv/Kconfig.socs b/arch/riscv/Kconfig.socs
>> index 00c2b205654c..9cb38bc9d7cd 100644
>> --- a/arch/riscv/Kconfig.socs
>> +++ b/arch/riscv/Kconfig.socs
>> @@ -9,6 +9,7 @@ config SOC_MICROCHIP_POLARFIRE
>>
>> config SOC_SIFIVE
>> bool "SiFive SoCs"
>> + depends on !XIP_KERNEL
>> select SERIAL_SIFIVE if TTY
>> select SERIAL_SIFIVE_CONSOLE if TTY
>> select CLK_SIFIVE
>> --
>> 2.20.1
>>
>>
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>> linux-riscv@lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/linux-riscv
>
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