Quanzhi A13 tossing memo

The boot process ：

uboot-with-spl  --> kernel --> os

In fact, it's mainly uboot-with-spl This piece of , according to OLinuXino That's what I'm saying ,uboot There are two kinds of ,sunxi uboot;mainline uboot, They are Quan Zhi and uboot Official website 2 A version . The document only says that the supported memory is different ,sunxi uboot Suitable for modern memory , The mainline supports Samsung and Hyundai .

from OLinuXino Let's take a look at the documents , Compile directly Uboot Just one uboot-with-spl All right , But some documents say that they are compiled 2 Files （spl uboot）.

Burn to tf Card method ：

sudo dd if=u-boot-sunxi-with-spl.bin of=/dev/sdX bs=1024 seek=8

Should be A13 SOC On chip ROM The startup process attempts to read tf The first sector of the card to obtain the boot device , Of course, if you put uboot It is also possible to use it as a user-defined program ,SOC On film 48k RAM Should be able to do something , It's just that DDR3, Can run Linux Better .

 Uboot Use the following command to configure a boot.scr file , Used to configure loading kernel and kernel parameters (script.bin) file .

Now you have to create a new boot.cmd file with the following contain

setenv bootm_boot_mode sec
setenv bootargs console=ttyS0,115200 root=/dev/mmcblk0p2 rootwait panic=10
load mmc 0:1 0x43000000 script.bin || load mmc 0:1 0x43000000 boot/script.bin
load mmc 0:1 0x42000000 uImage || load mmc 0:1 0x42000000 boot/uImage
bootm 0x42000000

convert boot.cmd in boot.scr with the next command

# mkimage -C none -A arm -T script -d boot.cmd boot.scr
 
The result should be a new boot.scr file that you have to copy to the first SD card partitition(where uImage and script.bin file are located)

The actual kernel only needs to exist tf The first partition of the card （FAT32） That's all right. . With the kernel , The follow-up will be easy .

Prepare first uboot Part of it , Wait till the weekend to see if the board can come out ,DDR3 The routing feeling may not be able to initialize normally , although uboot It can be configured inside DRAM frequency 408M, But it's hard to say. . If you initialize DDR3 After that , After that, it will be much more fun to make boards .