1.save framebuffer

(1) method1:    we can dump mem,and use t32 to resume framebuffer.

Kernel space Framebuffer address:

setup_fb_mem ph vr screen_base 0xdec00000

該FB地址亦可以在專案中dts中查到

d.image 0xdec00000 480. 800. /RGBX888

Bootloader space framebbuffer address:

#define FB_RAM_BASE                        (LPDDR0_BASE_ADDR + 0x05f00000)

(2)method2:    adb shell gsnap /data/1.jpg /dev/graphics/fb0
                          adb pull /data/1.jpg D:\

2.save dispc && dsi register's value.

展訊lookat工具，檢視統一編址的物理暫存器值，用法介紹

Usage: lookat [-l nword] [-s value] [-h] addr_in_hex
get/set the value of IO reg at addr_in_hex
  -l nword     print values of nword continous regs start from
               addr_in_hex in a formated way
  -s value     set a reg at addr_in_hex to value
  -h           print this message

 NOTE:
 * the addr_in_hex should be 4-byte aligned in hex form
 * Default is physical address, Using Virtual address If the
 * parameters are capital letter: Only the [-L],[-S],(Read/Write)
 * will use virtual address

(1)step1:adb shell(enter phone's shell)
(2)step2:lookat -l 50 0x21000000(print dispc register value with lookat tool)
(3)step3:lookat -l 50 0x60100000(print dsi register value with lookat tool)