在U boot中使用bootm(ex:bootm 20008000 20800000)指令來執行kernel
"common/cmd_bootm.c"的do_bootm()為該指令的entry point，其主要的工作如下：
(1) 最主要是取得uImage header (uImage 前0x40 bytes),該header主要紀錄二個重要資訊 OS ID (IH_OS_LINUX)與kernel entry point address (zImage) , 該header是由tools/mkimage產生的:
tools/mkimage -A arm -O linux -T kernel -C none -a 0x20008000 -e
0x20008040 -n "kernel" -d zImage zImage-uboot
tools/mkimage -A arm -O linux -T ramdisk -C none -a 0x20800000 -n
"ramdisk" -d ramdisk.img ramdisk-uboot.img
(2) 再將該header與load address of ramdisk-uboot (argv[2])傳入do_bootm_linux() (lib_arm/bootm.c),由分析header取得 kernel entry point address (function pointer), 再透過boot_get_ramdisk() (common/image.c)取得ramdisk start address(rd_start) (即the load address of ramdisk-uboot+header size(0x40))和 ramdisk end address(rd_end)(rd_start+rd_len, 執行mkimage時會將 rd_len值assign 給image header ( image_header) 的 ih_size ( Image Data Size)) , 一但知道ramdisk start address和ramdisk end address就可以設定ATAG 的INITRD TAG, 再設定其他的ATAG (ex: CMDLINE TAG) , 就可以知道kernel entry point 的 paramters: paramter 1=0 (r0), paramter 2=machine id(r2) , parameter 3=ATAG的位置(r3) , 最後就執行kernel entry point。
4 則留言:
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