Re: [PATCH v7] RISC-V: enable XIP

David Hildenbrand
2021-04-09T14:17:00Z

On 09.04.21 16:10, Mike Rapoport wrote:
> On Fri, Apr 09, 2021 at 02:07:24PM +0200, David Hildenbrand wrote:
>> On 09.04.21 13:39, Alex Ghiti wrote:
>>> Hi David,
>>
>> I assume you still somehow create the direct mapping for the kernel, right?
>> So it's really some memory region with a direct mapping but without a memmap
>> (and right now, without a resource), correct?
>
> XIP kernel text is not a region in memory to begin with ;-)

I think that's the part that confused me. I thought it would be mapped
somehow into physical address space and would be addressed like other
memory -- just that reads would be rewired to go to flash.

>
> It resides in a flash and it is executed directly from there without being
> relocated to RAM.
>
> That's why it does not need neither direct mapping, nor struct pages.

Thanks for clarifying! :)

--
Thanks,

David / dhildenb