What could be the reason for the failure to download the new drawing board?
Check if there are SFBL prints after powering on the board.
No SFBL print after power-on
Are there any pins that require special attention?
Please check what the log output looks like, verify whether your serial chip supports a baud rate of 3M, and also check if there are any虚焊 or short circuits in the flash connection.
Resolved: NOR FLASH soldering issue
Downloaded a serial port program to print “hello world,” but there’s no output from the serial port after successful download. What could be the issue? 
Default print baud rate 1M
This code can be printed normally when downloaded to Huangshan Pai.
Haven’t encountered this situation before. Try using the lcd_n16r8 board to see if it can run.
I’m using the lcd_n16r8 board. I tried configuring a pin to output PWM, but there’s no output—appears that the code was downloaded successfully but isn’t running. Any suggestions on how to troubleshoot this issue?
What model of NOR flash chip is being used?
The plan is to use PY25Q256HB-SUH-IT, but currently using PY25Q128HA-WXH-IR.
Same as the黄山Pai module powering up NOR
So how is it designed in terms of hardware? Are there any additional pull-up resistors on the MPI pins?
The MPI pins do not have additional pull-up resistors, but a 22-ohm resistor is connected in series. This is the schematic of the board.
