RE: mmc-utils: ioctl connection timed out with SD cards

["Christian Löhle" <CLoehle@hyperstone.com>]

The problem is the harcoded 0x0001 as RCA, sdcards have whatever the vendor thinks is right.
I can send a fix for that tomorrow, but generally mmc-utils isn't much useful for SD cards, most mmc-utils features are eMMC-only features anyway.
Softreset works as expected, for byte-addressed we can use grouped wp.
I was thinking about adding TMP_WRITE_PROTECT for both, maybe unlock, too.
And also adapt erase.
Apart from that do you have any features that you can think of?
SD just doesn't have that many features that are used outside of normal IO operation.
Another candidate would be FULE, but cards that support it are rare.

Regards,
Christian

-----Original Message-----
From: Dominik 'Rathann' Mierzejewski <dominik@greysector.net> 
Sent: Tuesday, April 4, 2023 12:09 PM
To: linux-mmc@vger.kernel.org
Subject: Re: mmc-utils: ioctl connection timed out with SD cards

On Monday, 03 April 2023 at 22:11, Christian Löhle wrote:
> >Hello,
> >is the mmc tool from mmc-utils supposed to work with SD cards?
> Not really no, but status get is pretty much the one thing that should 
> work, apart from register reads that don't issue anything.

I see. I thought any /dev/mmcblk? device would be supported. The documentation doesn't make this clear. :)

> I'm using RK3399 on SD too and it works okay for me, will try updating 
> tomorrow.
> Could you show the debug prints to see the mmc command / responses?
> Ideally for anything in mmc/core

Will something like:

# alias ddcmd='echo $* > /proc/dynamic_debug/control'
# ddcmd 'module mmc_core +p'
# ddcmd 'module rtsx_pci_sdmmc +p'
# mmc status get /dev/mmcblk0
# dmesg | grep -E 'mmc_core|rtsx_pci_sdmmc'

suffice?

Regards,
Dominik
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