tablet - Marquis Tablet、OMAP 串口连接垃圾

Question

我将串行连接焊接到 Marquis Tablet MP977 以将直接外壳插入根目录。我使用的是电缆 1（9 针到 USB/图片 1），然后是 adafruit 一（图片2），我尝试了从 9600 到 115200 的所有串行速度。我得到的只是这个

M\0x9e\0x08\0x0c\0xc6\0x89\0x1f^\0xd0\0xd2r_=\0xf4\0x0e\0x9a\0x00[\0xe8RhI\0xd2\0xdb\0x88\0x003\0xc9\0xb8\0x1a\0x14=\0x13d* 3\0xcd\0xb1\0x9e\0x9b\0x1a4b4\0xe7\0xe7Z.\0xc0*\0xf8\0x93\0xb9 3\0x9d/s\0x99F\0x1f\0xfbd\0x19\0x93\0xebY\0x12\0xe9\0x9a ^\ 0x1eJ^ZNKM\0x00M^L\0xe7\0x12\0x1a {\0xf4\0xe9&X\0x0038\0xcec\0xf4\0xcb\0xa7\0xdd\0xe33\0xdd\0xb2\0xd1-\0xc9,\0xcc\0x00\0x00q\0x17 \0xd7\0x11{W\0x17\0xae\0xd4\0xa9\0xc8q\0xd5W\0x95\0xf2W\0xd7\0xaf\0x13\0x91\Z\0x16\0x95\0xbd\0x85\0xa1M]\0xfd\0xc2U\0xffZ] \0xc5u\0x93\0xd3\0xafE\0xaa\0xa4\0x14\0x95\0x97j\0x95\0xd7\0x81\0xe8.\0x00q\0xaf\0xd7\0xad\0x97\0xd5\0x13\0xae\0xf4\0x13\0x17\ 0xbdT\

Answer 1

I guess the problem were the USB-SERIAL cables 5-3.3v lelvel, because different cables yeld different garbage. I had somewhere a FTDI UB232, and I used it as serial and everything works OK. You can use this post as marquise hacking

OMAP44XX TAB # printenv
bootargs=console=ttyO2,115200n8 mem=456M@0x80000000     mem=512M@0xA0000000 init=/init vram=48M omapfb.vram=0:32M         androidboot.console=ttyO2
bootcmd=booti mmc1
bootdelay=1
baudrate=115200
ipaddr=128.247.77.90
serverip=128.247.77.158
netmask=255.255.254.0
        bootfile="uImage"                                                                                                             ethact=KS8851SNL                                                                                                                                                                                                                                                Environment size: 285/131068 bytes