On Tue, Apr 9, 2024 at 11:44 PM Bo Gan ganboing@gmail.com wrote:
On 4/9/24 6:55 PM, E Shattow wrote:
Original speed class SD cards fail with this change "unable to change mode".
The BUS_ROOT clock will have to be switched to PLL2 anyway in U-Boot proper or in Linux, because it's the parent or grandparent clock for *lots* of devices, including PCIe, i2c, spi, qspi... If there's an issue with this change, then I suspect there's something wrong with the dw_mmc driver.
Bo
I've bisected and can confirm this change is what breaks original speed SD function on Milk-V Mars CM Lite (DFRobot mini router carrier). Class 10 speed SD media does not seem to be affected. Reverting the change allows the original speed SD media access to function again. SD access is functional in Linux with and without the change.
How to troubleshoot this?
Thanks,
E