Re: [SPAM] [RFC PATCH v42 90/98] hw/sd/sdcard: Add experimental 'x-aspeed-emmc-kludge' property

[Andrew Jeffery]

On Tue, 2024-07-02 at 18:15 +0200, Philippe Mathieu-Daudé wrote:
> On 2/7/24 07:06, Andrew Jeffery wrote:
> > On Fri, 2024-06-28 at 11:16 +0200, Cédric Le Goater wrote:
> > > On 6/28/24 9:02 AM, Philippe Mathieu-Daudé wrote:
> > > > When booting U-boot/Linux on Aspeed boards via eMMC,
> > > > some commands don't behave as expected from the spec.
> > > > 
> > > > Add the 'x-aspeed-emmc-kludge' property to allow non
> > > > standard uses until we figure out the reasons.
> > > 
> > > I am not aware of any singularity in the eMMC logic provided by Aspeed.
> > > U-Boot and Linux drivers seem very generic. May be others can tell.
> > 
> > I'm not aware of any command kludges. The main problem I had when I
> > wrote the Linux driver for the Aspeed controller was the phase tuning,
> > but that doesn't sound related.
> 
> Yeah I don't think anything Aspeed nor U-boot related, we
> model CSD/CID registers per the SD spec, not MMC. Various
> fields are identical, but few differ, this might be the
> problem.
> 
> I rather respect the spec by default, so until we figure
> the issue, are you OK to use a 'x-emmc-kludge' property
> and set it on the Aspeed boards?

Dropping the implication that it's the fault of the Aspeed controller
seems reasonable (without further evidence that it's true).

Andrew