Maskrom: How to tell what's on the SD card?

[zogkarndon]

rkdeveloptool runs on your Linux laptop, which you connect to the PineTab via a USB (A-C or C-C) cable. (This is not the UART adapter cable.)

You can use `./rkdeveloptool ld` to check whether it can talk to your PineTab. For this to work it needs to be in MaskROM mode, which I'm guessing you achieved by interrupting the boot process with your UART adapter.

From there you're on your own because I don't own any rockchip hardware, however you can read the "Erase eMMC" section here: https://wiki.radxa.com/Rock5/install/usb-install-emmc

There's also an "erase flash" command (`./rkdeveloptool ef`) but I'm not sure that it does what I think it does..

I built rkdeveloptool, but when I connect the PineTab's upper USB port to my laptop, neither lsusb nor rkdeveloptool show a device.

I also tried connecting to the upper port of the UART adapter, with the same results.