[U-Boot] [PATCH v3 13/20] spl: nand: sunxi: use PIO instead of DMA

[Maxime Ripard]

Hi,

On Tue, Jul 06, 2021 at 06:00:33PM +0200, Miquel Raynal wrote:
> Hi Maxime,
> 
> Maxime Ripard <maxime at cerno.tech> wrote on Thu, 24 Jun 2021 14:05:40
> +0200:
> 
> > Hi Miquel,
> > 
> > On Wed, Feb 28, 2018 at 08:51:55PM +0100, Miquel Raynal wrote:
> > > SPL support was first written to support only the earlier generations of
> > > Allwinner SoCs, and was only really enabled on the A13 / GR8. However,
> > > those old SoCs had a DMA engine that has been replaced since the A31 by
> > > another DMA controller that is no longer compatible.
> > > 
> > > Since the code directly uses that DMA controller, it cannot operate
> > > properly on the later SoCs, while the NAND controller has not changed.
> > > 
> > > There's two paths forward, the first one would have been to add support
> > > for that DMA controller too, the second to just remove the DMA usage
> > > entirely and rely on PIO.
> > > 
> > > The later has been chosen because CPU overload at this stage is not an
> > > issue and it makes the driver more generic, and easier to understand.
> > > 
> > > Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
> > > Acked-by: Boris Brezillon <boris.brezillon at bootlin.com>  
> > 
> > I'm a bit late to the party, but this bricks the CHIP Pro too. While
> > U-Boot proper seems to be flashed properly (re-reading it from the NAND
> > after flashing brings up the same CRC than the original image), the SPL
> > will only read 0s.
> > 
> > The transfer does complete though, so maybe it's just the copy from the
> > SRAM to the main memory that doesn't work?
> > 
> > The offset looks correct though, so I'm not sure.
> 
> Strange... I really have no idea what's going on here and especially I
> don't have any suitable board with me these days to troubleshoot this.
> 
> Sorry for not being helpful at all on this one :-)

Paul has two CHIP Pro, and there might be more at the Bootlin office

Maxime
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 228 bytes
Desc: not available
URL: <https://lists.denx.de/pipermail/u-boot/attachments/20210707/01615c72/attachment.sig>