Hi,
Le lun., oct. 17 2022 at 20:29:27 +0300, Siarhei Volkau
<lis8215@xxxxxxxxx> a écrit :
пн, 17 окт. 2022 г. в 12:34, Paul Cercueil
<paul@xxxxxxxxxxxxxxx>:
Can you verify that?
It should be pretty simple, if it has the bug you'll see I/O errors
on
the SD card.
Well, the result is ambiguous:
Without that 'broken' flag: mmc works poorly, but becomes more or less
stable when MMC clock downs to 6MHz (90% boots without errors).
On the 12MHz MMC clock the issue doesn't appear in 50-70% cases.
On the 24MHz MMC clock the device never boots up.
However with the flag: MMC works stable on 24MHz MMC clock
(boot issue observed only once), but if I increase MMC clock speed
even
a bit the problem appears oftenly ( >70% of cases).
So, that flag definitely helps a lot, but the nature of the problem
might be
different.
If the flag makes any difference then it's needed.
The controller should support up to 50 MHz, make sure that your "mmc"
clock is at 50 MHz otherwise changing the max-frequency DT property
won't do much.
Cheers,
-Paul
