I’m testing Jetson Nano with my custom carrier board and sd card Read/Write is too slow. Read speed is 1.5MB.
And I’m using 512GB samsung sd card and it supports uhs speed.
Actually I found ‘9875882.diff’ patch for this issue and applied it. But it’s not getting better.
When I check dmesg logs, setting signal voltage as 180 has no problem.
But I could see below error log after setting send cid function.
‘fallback to HS enumeration’
Here is my mmc1/ios info.
clock: 50000000 Hz
vdd: 21 (3.3 ~ 3.4 V)
bus mode: 2 (push-pull)
chip select: 0 (don’t care)
power mode: 2 (on)
bus width: 2 (4 bits)
timing spec: 2 (sd high-speed)
signal voltage: 1 (1.80 V)
driver type: 0 (driver type B)
Could you help me about this issue?
Thanks in advance.