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I am working on setting up a bootable SD card for a Rockchip SOQuartz CM4.

I am able to build uboot for this target, write it to an SD card along with a rootfs image and kernel, load uboot, and get to a uboot terminal. I am trying to take the next step of locating the kernel/rootfs image on the SD card, and boot it.

When I view the SD card on my host machine, I can see the BOOT partition which contains the Kernel image file, the device tree DTB file for this board, and an overlays file with several device tree overlay DTBO files. The SD card also has a squashfs formatted root file system partition. The uboot binary has been installed at sector 64, according to the Rockchip documentation.

When I boot from this SD card, I am able to observe the first stage bootloader, U-Boot SPL, and U-Boot proper all load on the terminal. However, I am getting several errors related to voltage select on the SD card. This is preventing me from seeing the partitions on the SD card with commands like mmc part or mmc info:

U-Boot 2024.01-rc2-g169c3cc4 (Nov 17 2023 - 15:01:56 -0500) Model: Pine64 RK3566 SoQuartz with CM4-IO Carrier Board DRAM: 2 GiB PMIC: RK8090 (on=0x40, off=0x00) Core: 312 devices, 27 uclasses, devicetree: separate MMC: mmc@fe2b0000: 1, mmc@fe2c0000: 2, mmc@fe310000: 0 Loading Environment from nowhere... OK In: serial@fe660000 Out: serial@fe660000 Err: serial@fe660000 Model: Pine64 RK3566 SoQuartz with CM4-IO Carrier Board Net: eth0: ethernet@fe010000 Hit any key to stop autoboot: 0 Error: unknown compression type. Card did not respond to voltage select! : -110 pcie_dw_rockchip pcie@fe260000: PCIe-0 Link Fail pcie_dw_rockchip pcie@fe260000: PCIe-0 Link Fail scanning bus for devices... Bus usb@fcc00000: Register 2000140 NbrPorts 2 Starting the controller USB XHCI 1.10 scanning bus usb@fcc00000 for devices... 2 USB Device(s) found pcie_dw_rockchip pcie@fe260000: PCIe-0 Link Fail ethernet@fe010000 Waiting for PHY auto negotiation to complete......... TIMEOUT ! phy_startup() failed: -110FAILED: -110pcie_dw_rockchip pcie@fe260000: PCIe-0 Link Fail ethernet@fe010000 Waiting for PHY auto negotiation to complete......... TIMEOUT ! phy_startup() failed: -110FAILED: -110=> => mmc info Card did not respond to voltage select! : -110 => mmc part Card did not respond to voltage select! : -110 =>

What is the cause of this error? Is there something wrong with my SD card? I assume my SD card is fine, because it is able to load U-Boot and get me to this point. If it matters, it is a Sandisk UHS-I 16 GB SD card.

What steps should I take to get U-Boot to find my SD card partitions and the files that are installed on them?

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Reset to default
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Update: I was able to resolve the "Card did not respond to voltage select! : -110" error by using the "mmc dev" command to change the speed mode of the mmc interface.

=> mmc list mmc@fe2b0000: 1 (SD) mmc@fe2c0000: 2 mmc@fe310000: 0 => mmc dev Card did not respond to voltage select! : -110 => mmc part Card did not respond to voltage select! : -110 => mmc info Card did not respond to voltage select! : -110 => mmc list mmc@fe2b0000: 1 (SD) mmc@fe2c0000: 2 mmc@fe310000: 0 => mmc dev 1 0 6 switch to partitions #0, OK mmc1 is current device => mmc info Device: mmc@fe2b0000 Manufacturer ID: 3 OEM: 5344 Name: SL16G Bus Speed: 50000000 Mode: SD High Speed (50MHz) Rd Block Len: 512 SD version 3.0 High Capacity: Yes Capacity: 14.8 GiB Bus Width: 4-bit Erase Group Size: 512 Bytes => mmc part Partition Map for MMC device 1 -- Partition Type: DOS Part Start Sector Num Sectors UUID Type 1 31314 289044 00000000-01 0c Boot 2 609402 289044 00000000-02 83 3 1187490 289044 00000000-03 83 4 1476534 29639754 00000000-04 83

Observe that in this log, my initial calls to "mmc info" and "mmc part" both return the voltage select error. After I set the mmc speed with "mmc dev 1 0 6", I was able to get info from the SD card.

"mmc dev 1 0 6" breakdown: mmc dev command, device 1 (listed as SD), partition 0, speed mode 6. Speed mode 6 = UHS SDR25 (50 MHz). Other speed modes might work as well. This was the first one I tried.

Full documentation on the uboot mmc command can be found here: https://docs.u-boot.org/en/latest/usage/cmd/mmc.html

I have more work to do to actually find my files on my partition, but I'm closer to actually exploring the SD card now. Hopefully this step is useful for someone in the future.

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    This helped me. Had this issue on an orange pi 3b. Thanks for your contribution Commented Sep 22 at 23:29

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