u-boot启动linux系统的代码分析_linux启动代码分析资源-CSDN文库

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u-boot 启动内核代码

一．系统中存放的环境变量。

arch=riscv

autostart=yes

baudrate=115200

board=jh7100

board_name=jh7100

boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}

boot_efi_binary=load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} efi/boot/bootriscv64.efi; if fdt addr

${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r};else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi

boot_efi_bootmgr=if fdt addr ${fdt_addr_r}; then bootefi bootmgr ${fdt_addr_r};else bootefi bootmgr;fi

boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} ${prefix}${boot_syslinux_conf}

boot_prefixes=/ /boot/

boot_script_dhcp=boot.scr.uimg

boot_scripts=boot.scr.uimg boot.scr

boot_syslinux_conf=extlinux/extlinux.conf

boot_targets=dhcp mmc0

bootcmd_dhcp=devtype=dhcp; if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile

${fdtfile}; setenv efi_old_vci ${bootp_vci};setenv efi_old_arch ${bootp_arch};setenv bootp_vci

PXEClient:Arch:00027:UNDI:003000;setenv bootp_arch 0x1b;if dhcp ${kernel_addr_r}; then tftpboot ${fdt_addr_r}

dtb/${efi_fdtfile};if fdt addr ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r}; else bootefi ${kernel_addr_r}

${fdtcontroladdr};fi;fi;setenv bootp_vci ${efi_old_vci};setenv bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv

efi_old_arch;setenv efi_old_vci;

bootcmd_mmc0=devnum=0; run mmc_boot

bootdelay=2

bootdir=/boot

bootenv=uEnv.txt

bootpart=0:3

cpu=fu740

distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done

efi_dtb_prefixes=/ /dtb/ /dtb/current/

ethact=dwmac.10020000

ethaddr=6c:cf:39:00:07:39

ext4bootenv=ext4load mmc ${bootpart} ${loadaddr} ${bootdir}/${bootenv}

fatenv=fatload mmc ${testpart} ${loadaddr} ${testenv};env import -t ${loadaddr} ${filesize}

fdt_addr_r=0x88000000

fdtcontroladdr=ff6c96e0

fdtfile=starfive/jh7100-visionfive.dtb

fdtsetup=fdt addr ${fdtcontroladdr}

fileaddr=88300000

filesize=127ae8

importbootenv=echo Importing environment from mmc${mmcdev} ...; env import -t ${loadaddr} ${filesize}

ipaddr=192.168.1.122

kernel_addr_r=0x84000000

kernel_comp_addr_r=0x90000000

kernel_comp_size=0x10000000

load_efi_dtb=load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} ${prefix}${efi_fdtfile}

loadaddr=0xa0000000

loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}

mmc_boot=if mmc dev ${devnum}; then devtype=mmc; run scan_dev_for_boot_part; fi

mmcbootenv=setenv bootpart ${mmcdev}:${mmcpart};

mmc dev ${mmcdev};

if mmc rescan; then run loadbootenv && run importbootenv; run ext4bootenv && run importbootenv;

if test -n $uenvcmd; then echo Running uenvcmd ...;

run uenvcmd; fi; fi

mmcdev=0

mmcpart=3

mmcsetup=mmc part

preboot=run mmcbootenv

ramdisk_addr_r=0x88300000

scan_dev_for_boot=echo Scanning ${devtype} ${devnum}:${distro_bootpart}...; for prefix in ${boot_prefixes}; do run

scan_dev_for_extlinux; run scan_dev_for_scripts; done;run scan_dev_for_efi;

scan_dev_for_boot_part=part list ${devtype} ${devnum} -bootable devplist; env exists devplist || setenv devplist 1; for

distro_bootpart in ${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart} bootfstype; then run

scan_dev_for_boot; fi; done; setenv devplist

scan_dev_for_efi=setenv efi_fdtfile ${fdtfile}; for prefix in ${efi_dtb_prefixes}; do if test -e ${devtype}

${devnum}:${distro_bootpart} ${prefix}${efi_fdtfile}; then run load_efi_dtb; fi;done;run boot_efi_bootmgr;if test -e

${devtype} ${devnum}:${distro_bootpart} efi/boot/bootriscv64.efi; then echo Found EFI removable media binary

efi/boot/bootriscv64.efi; run boot_efi_binary; echo EFI LOAD FAILED: continuing...; fi; setenv efi_fdtfile

scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${boot_syslinux_conf}; then echo

Found ${prefix}${boot_syslinux_conf}; run boot_extlinux; echo SCRIPT FAILED: continuing...; fi

scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${script};

then echo Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED: continuing...; fi; done

scan_sf_for_scripts=${devtype} read ${scriptaddr} ${script_offset_f} ${script_size_f}; source ${scriptaddr}; echo SCRIPT

FAILED: continuing...

serial#=VF7100A1-2220-D008E000-0000073A

serverip=192.168.1.120

sf_boot=if sf probe ${busnum}; then devtype=sf; run scan_sf_for_scripts; fi

soc=jh7100

stderr=serial@12440000

stdin=serial@12440000

stdout=serial@12440000

testenv=u74_uEnv.txt

testpart=0:1

vendor=starfive

ver=U-Boot 2022.01-rc4-VisionFive-g0c08d335c5-dirty (Jul 11 2022 - 02:02:24 -0700)StarFive

经过：

do_bootm(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])

do_bootm_states(cmdtp, flag, argc, argv, BOOTM_STATE_START |

最终会调用到：

D:\workspace\visionsife\u-boot-simple\boot\bootm.c 中的如下函数。

int do_bootm_states(struct cmd_tbl *cmdtp, int flag, int argc,

剩余13页未读，继续阅读

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