Messages in this thread | | | From | Siarhei Volkau <> | Date | Mon, 17 Oct 2022 20:29:27 +0300 | Subject | Re: [PATCH v2 2/2] dmaengine: JZ4780: Add support for the JZ4755. |
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пн, 17 окт. 2022 г. в 12:34, Paul Cercueil <paul@crapouillou.net>: > 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.
BR, Siarhei
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