How to use the SD slot on a CM4 with EMMC about raspberry-pi-cm4-tv-stick

[magic-blue-smoke]

@tyon2006
This issue is on CM4 side. Processor pins for storage are shared between soldered eMMC chip and external SD card. Also, there's no way to multiplex or address particular storage when both are present. Ie processor can't tell eMMC "please tristate your output buffers and disable receiving commands, I'm talking to SD-card" and vice versa. This results in two storage devices getting same commands and end up one device is pulling wire low and another to high at some point, effectively making direct connection between power and ground, which is not good.

Going to super extremes, you can try to check if someone have tried to desolder eMMC, but this is not something I've recommended to you :)

There are only two things I can really recommend here:

• keep watching Raspberry Pi locator, but I guess this is something you're already doing
• use WiFi dongle at the price of occupied USB connector (alternatively, if skills and aesthetics allows, solder it to the GND, DM, DP and 5V golden pads on a back side of TV Stick, keeping both USB connectors available for other devices)