Hank Barta <hba...@gmail.com> writes: > ** Kernel log: > [ 723.735217] mmc0: sdhci: Timeout: 0x00000000 | Int stat: 0x00018000 > [ 723.741743] mmc0: sdhci: Int enab: 0x00ff1003 | Sig enab: 0x00ff1003 > [ 723.748270] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000001 > [ 723.754797] mmc0: sdhci: Caps: 0x45ee6432 | Caps_1: 0x0000a525 > [ 723.761324] mmc0: sdhci: Cmd: 0x00000502 | Max curr: 0x00080008 > [ 723.767851] mmc0: sdhci: Resp[0]: 0x000001aa | Resp[1]: 0x00000000 > [ 723.774379] mmc0: sdhci: Resp[2]: 0x00000000 | Resp[3]: 0x00000000 > [ 723.780905] mmc0: sdhci: Host ctl2: 0x00000000 > [ 723.785404] mmc0: sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x00000000 > [ 723.791930] mmc0: sdhci: ============================================ > [ 733.923993] mmc0: Timeout waiting for hardware cmd interrupt.
These repeated messages are normal on the RPi4 if you boot it without an SD card. E.g. from USB or network. If that's what you intend to do, then you can avoid the repeated messages by adding dtparam=sd_poll_once=on to the config.txt file in your firmware partition. Often mounted as /boot/firmware/. The effect depends on which device-tree you are using. I believe it will only work with the ones coming with the Raspberry Pi firmware. See https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README for docs. Bjørn
