Embedded Development Study Notes (yl2440, some notes)

1, When I use JTAG to burn bootloader, if I click the BAT file, it will flash because no driver is installed. 2, In bootloader, delay (about 10 ms) is performed before drawing the LCD; otherwise, the entire bootloader cannot be started when it dies. I do not know why 3, The last part of the bootloader partition (partition 0) is used to store the configuration information of the bootloader. Erase is required when you re-burn the bootloader. Otherwise, the original configuration is used after the bootloader is installed. 4, When re-writing the OS image, you also need to remove the erase partition. Otherwise, there may be various strange problems. 5, You can use USB to boot loader to the memory and then burn it into flash without using JTAG every time, which is too slow. 6, Use USB Download Bootloader It cannot be written to the first partition. I still don't know why. It turns out it works. A) Yes, you must write it. Zero X 30200000 , Cannot write 30200000 7, When using ads, the variable declaration in the function must begin with the first line, and there cannot be any other statements in the middle. Otherwise, the compilation fails. That is to say, all the variable declarations must be placed at the beginning of the function, which is so strange (depressed for a long time ). 8, In ads, if the source file is modified elsewhere, it will not be re-compiled during make. It must be modified in ads before making can be made directly, otherwise it will not work. You can also disable ads and re-open the MCP file. 9, The bin downloaded from 0x30200000 cannot be decompressed. The bin downloaded from 0x3200000 can be decompressed. 0x30200000 you can also directly download the nb0 file instead of Bin 10, If the new bootloader directly downloads the nb0 file and writes it in, there will be some problems. I guess it is missing some parameters in the bootparams, and the value of the last parameter cannot be 15 or 14, and display "display = shp240"