[U-Boot] [PATCH v2 4/8] nios2: enlarge the code relocation range

[Marek Vasut]

On Monday, September 07, 2015 at 03:47:46 AM, Thomas Chou wrote:
> Hi Marek,

Hi!

> On 09/07/2015 08:53 AM, Marek Vasut wrote:
> > Where did that 64KB figure come from ? :O
> 
> This is estimated from 41KB of the SPL of socfpga. The code density of
> nios2 is worse than ARM.
> 
> > I assume the simple loader is just a copy loop, huh ? And you synthesise
> > a small RAM or ROM into the FPGA and point NIOS to boot from that, right?
> 
> Right. It is hidden from the user in qsys. You will need to dig into the
> code to find out. The EPCS boot copier is coded in nios2 ASM.

Oh, I see.

> > What about U-Boot TPL, can that cook the loader ? (yes, I'd like to be as
> > independent of the external code as possible).
> 
> I'd like to be independent of the external code, too. In the past, I
> have my own SPI core (now the oc_tiny_spi) to control EPCS, which is
> actually SPI flash, and my own boot copier with/out decompression.
> 
> It is possible to add an TPL support for nios2 EPCS. If someone want to
> work on it.. :)

I'll keep this in mind, thanks :)

Best regards,
Marek Vasut