08-15-2022, 06:13 PM
Are you sure your serial interface is working well? Is RADXA using 1500 000 baud speed too? If the serial works at slower speed this is not indicative of it being capable of working at 1500 000 baud (unless it uses CH340G chip which is known to work).
Additionally, just in case I'll mention the CH3640g chip can run with 5V IO or 3.3V IO. Some adapters have a jumper to set this. Others can be easily modified if they are set for the other voltage.
Do you perhaps have an oscilloscope you can connect it to and look at the signal? I don't have Quartz64-B hardware. Just a soquartz and Quartz64-A, but even when I tried images that did't work because of a kernel panic etc I still get good output on the serial port. I could see u-boot, the image trying to boot etc.
I doubt very much that there is some hardware problem on Quartz64-B board that requires additional resistors etc to make it work. If you measure voltage that is too high on your serial adapter my first guess would be that it is configured for 5V.
Here you have the link to the datasheet for then chip in case you need to modify the adapter. https://www.insidegadgets.com/wp-content...asheet.pdf Look at page 5 (application notes).
Additionally, just in case I'll mention the CH3640g chip can run with 5V IO or 3.3V IO. Some adapters have a jumper to set this. Others can be easily modified if they are set for the other voltage.
Do you perhaps have an oscilloscope you can connect it to and look at the signal? I don't have Quartz64-B hardware. Just a soquartz and Quartz64-A, but even when I tried images that did't work because of a kernel panic etc I still get good output on the serial port. I could see u-boot, the image trying to boot etc.
I doubt very much that there is some hardware problem on Quartz64-B board that requires additional resistors etc to make it work. If you measure voltage that is too high on your serial adapter my first guess would be that it is configured for 5V.
Here you have the link to the datasheet for then chip in case you need to modify the adapter. https://www.insidegadgets.com/wp-content...asheet.pdf Look at page 5 (application notes).
