Re: [PATCH v4] RISC-V: Add an Image header that boot loader can parse.

[Atish Patra]

On Fri, 2019-06-28 at 12:09 -0700, Paul Walmsley wrote:
> On Thu, 6 Jun 2019, Atish Patra wrote:
> 
> > Currently, the last stage boot loaders such as U-Boot can accept
> > only
> > uImage which is an unnecessary additional step in automating boot
> > process.
> > 
> > Add an image header that boot loader understands and boot Linux
> > from
> > flat Image directly.
> 
> ...
> 
> 
> > +#if __riscv_xlen == 64
> > +	/* Image load offset(2MB) from start of RAM */
> > +	.dword 0x200000
> > +#else
> > +	/* Image load offset(4MB) from start of RAM */
> > +	.dword 0x400000
> > +#endif
> 
> Is there a rationale behind these load offset values?
> 

2MB/4MB alignment requirement is mandatory for current RISC-V kernel.
Anup had a patch that tried to remove that but not accepted yet.

https://patchwork.kernel.org/patch/10868465/


> 
> - Paul
> 
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-- 
Regards,
Atish