Thomas K
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- January 25, 2024 at 4:11 am in reply to: SD card fails for Kernel (error -110), but works in uboot #14280
Dear Neeraj,
sorry for the late reply. The pull-ups are there on the board, 9.8k to SYS_VDD1_3P3V on each line. SYS_VDD1_3P3V looks excellent, we even added some more capacitors, but with no effect.
I cannot check SYS_VDD3_3P3V because this is not connected to anything. Is this the possibly the root cause?
Thank you and best regards!
January 19, 2024 at 9:35 am in reply to: SD card fails for Kernel (error -110), but works in uboot #14269Dear Neeraj,
we played excessively with the detect pin and polarity, it is okay. The above mentioned GPIO error appears on the pocket beagle as well.
However, we maybe have a voltage issue. After the kernel is loaded, its seems like the data lines are not driven to 3.3 V anymore. We will investigate here further.
Reducing the bus speed did not have any effect.
Reducing the bus width to 1 results in errors like this:
[7.779753] mmc0: Got data interrupt 0x00000002 even though no data operation was in progress.
[18.158629] mmc0: Timeout waiting for hardware interrupt.
Best regards,
Thomas
January 15, 2024 at 10:09 am in reply to: SD card fails for Kernel (error -110), but works in uboot #14244Dear Neeraj,
thank you very much, this could have been plausible. The connection of the detect pin goes to C14 in our design as well and connected with a pull-up resistor. If the card is not inserted, the voltage is 2.5 V (not 3.3V for unknown reasons …), but cleanly 0 if inserted. We played with the cd-gpios setting (ACTIVE_HIGH, ACTIVE_LOW) interestingly with the same result (error -110). We also uncommented the cd-gpios line also with the same result. Playing with the bus-width changed the behaviour slitghtly which at least confirms the dtb file is properly loaded, but still produces errors.
Thank you and best regards,
Thomas
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