03-19-2021, 10:12 AM
Here's a brief update... Introducing a delay into the card detection, by adding "card-detect-delay = <0x320>;" into the relevant section of the device tree file, made no changes to the behavior of the A1-rated card; the write operation failed in the same way as before.
However, limiting the maximum speed of the card interface, by replacing "sd-uhs-sdr104;" with "sd-uhs-sdr50;" in the device tree file, resulted in a slower (10.4 MB/s vs. 13.8 MB/s; the latter was achieved with the non-A1-rated card) but successful write operation. Here are the kernel messages upon inserting the A1-rated card:
The investigation continues.
However, limiting the maximum speed of the card interface, by replacing "sd-uhs-sdr104;" with "sd-uhs-sdr50;" in the device tree file, resulted in a slower (10.4 MB/s vs. 13.8 MB/s; the latter was achieved with the non-A1-rated card) but successful write operation. Here are the kernel messages upon inserting the A1-rated card:
Code:
[ 76.077610] mmc_host mmc1: Bus speed (slot 0) = 100000000Hz (slot req 100000000Hz, actual 100000000HZ div = 0)
[ 76.310549] dwmmc_rockchip fe320000.mmc: Successfully tuned phase to 213
[ 76.310636] mmc1: new ultra high speed SDR50 SDHC card at address 5048
[ 76.312424] mmcblk1: mmc1:5048 SD16G 14.4 GiBThe investigation continues.
