这些日子都在研究快播大屏幕,但最终还是毁在自己手上了,然后开始研究Raspberry Pi了,昨天正好PL2303 USB TTL串口编程器到了,然后看见快播大屏幕上有3个奇怪的金属点,凭自己经验来看,这3个金属点一定内有蹊跷,通过万用表测量得出电压为3.3V,得出结论果然为TTL接口,下面附上接口定义图。
由于笔者不是专业维修人员,在单片机领域也算是一个打酱油的,昨天试图连接这几个触点也费了老大的力,最终在基友的帮忙下 用锋线针连接上。
既然TTL找到了,各位Geek们可以继续升入研究。。
以下是我昨天抓取到的信息
þ0x000000c4
00=0x00000000
01=0x00000000
02=0x00000320
03=0x0000017f
04=0x0000031c
05=0x00000000
06=0x00000000
07=0x000000c8
08=0x00000000
09=0x00000000
0a=0x00000000
0b=0x00000000
0c=0x00000000
0d=0x00000000
0e=0x00000000
0f=0x00000000
10=0x00000000
11=0x00000000
12=0x00000000
13=0x00000000
14=0x00000018
15=0x00000000
16=0x00000000
17=0x00000000
18=0x00000000
19=0x00000000
1a=0x00000000
1b=0x00000000
1c=0x00000000
1d=0x00000000
1e=0x00000180
1f=0x00000320
20=0x00000000
21=0x00000000
22=0x00000000
23=0x00000000
24=0x00000000
25=0x00000000
26=0x00000000
27=0x00000000
28=0x00000000
29=0x00000000
2a=0x001x0002a60b
wait pll03target is0210 now it is0x0000020f
wait pll1etarget is0210 now it is0x00000210
ddr3 : 00000210 MHz
Aug 3 201218:54:02
lane00 Success06
lane01 Success06
lane02 Success06
lane03 Success06
Stage 00 Result 00000000
Stage 01 Result 00000000
Stage 02 Result 00000000
Stage 03 Result 000000000×00000000
0x000000c8
Systemp Started
Boot From SPIucl decompress
0x8f800000
decompress t
U-Boot 2010.06-svn709([email protected]) (Aug 03 2012 – 18:52:44)
DRAM: 512 MiB
unknow ddr type
NAND: Amlogic nand flash uboot driver for M3, Version 1.1 (c) 2010 Amlogic Inc.
No NAND device found!!!
NAND device id: e8 d1 90 78 50 41
No NAND device found!!!
nandboot initialized error
nand init faile: -6
No NAND device found!!!
NAND device id: e8 d1 90 78 50 41
No NAND device found!!!
nandmulti initialized error
nand init faile: -6
read enviroment failed
*** Warning – bad CRC or NAND, using default environment
In: serial
Out: serial
Err: serial
Dcache status 1
Icache status 1
hold_time: 50000
i =2
outputmode = 720p
not set screen size yet
reboot_mode: 565756552
(Re)start USB…
USB: dwc_usb driver version: 2011-OCT-11
usb id mode: SW_HOST
usb clk_sel: XTAL input divided by 2
dwc_otg: usb_lowlevel_init: base addr: 0xc9040000
dwc_otg: No USB device found !
Error, couldn't init Lowlevel part
** Invalid boot device **
** Invalid boot device **
Normal Start…
Hit any key to stop autoboot: 0
Unknown command 'echog' – try 'help'
Wrong Image Format for bootm command
ERROR: can't get kernel image!
Unknown command 'echo' – try 'help'
Wrong Image Format for bootm command
ERROR: can't get kernel image!
8726M3_MBX #
哦~~~U-Boot哎……
应该有命令行操作的吧……