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請問 ramdisk

jiew
Expert 2272 points


1.我們的板子想用使用ramdisk 來當rootfs ( TI Linux SDK 6.0 )

   ramdisk 放置於SD卡 boot分區

2.我該如何修改uboot 讓kernel 開機可以自動載入ramdisk??

(不使用setenv 方式)

  • 0
    Intellectual 352 points

    可以参考以下命令，

    fatload mmc 0 $loadaddr uImage

    fatload mmc 0 $rdaddr ramdisk.gz

    setenv bootargs console=ttyO0,115200n8 root=/dev/ram0 rw initrd=$rdaddr,64M

    bootm

  • 0 回复 blaider wang
    Expert 2272 points

    Dear Blaider

    1.請問這些命令是要加再uboot 哪邊??

    2.或是有uenv.txt 可以參考??

    3.我看am335x_evm.h 的CONFIG_EXTRA_ENV_SETTINGS

        已經有你列出的命令,請問要如何修改呢??

       (我現在都會固定從mmc 抓取rootfs 然後抓不到)

    #define CONFIG_EXTRA_ENV_SETTINGS \
    "loadaddr=0x80200000\0" \
    "kloadaddr=0x80007fc0\0" \
    "fdtaddr=0x80F80000\0" \
    "fdt_high=0xffffffff\0" \
    "rdaddr=0x81000000\0" \
    "bootfile=uImage\0" \
    "fdtfile=\0" \
    "console=ttyO0,115200n8\0" \
    "optargs=\0" \
    "mtdids=" MTDIDS_DEFAULT "\0" \
    "mtdparts=" MTDPARTS_DEFAULT "\0" \
    "dfu_alt_info_mmc=" DFU_ALT_INFO_MMC "\0" \
    "dfu_alt_info_emmc=rawemmc mmc 0 3751936\0" \
    "dfu_alt_info_nand=" DFU_ALT_INFO_NAND "\0" \
    "mmcdev=0\0" \
    "mmcroot=/dev/mmcblk0p2 ro\0" \
    "mmcrootfstype=ext3 rootwait\0" \
    "nandroot=ubi0:rootfs rw ubi.mtd=7,2048\0" \
    "nandrootfstype=ubifs rootwait=1\0" \
    "nandsrcaddr=0x280000\0" \
    "nandimgsize=0x500000\0" \
    "rootpath=/export/rootfs\0" \
    "nfsopts=nolock\0" \
    "static_ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}" \
    "::off\0" \
    "ramroot=/dev/ram0 rw ramdisk_size=65536 initrd=${rdaddr},64M\0" \
    "ramrootfstype=ext2\0" \
    "ip_method=none\0" \
    "bootargs_defaults=setenv bootargs " \
    "console=${console} " \
    "${optargs}\0" \
    "mmcargs=run bootargs_defaults;" \
    "setenv bootargs ${bootargs} " \
    "root=${mmcroot} " \
    "rootfstype=${mmcrootfstype} ip=${ip_method}\0" \
    "nandargs=setenv bootargs console=${console} " \
    "${optargs} " \
    "root=${nandroot} " \
    "rootfstype=${nandrootfstype}\0" \
    "spiroot=/dev/mtdblock4 rw\0" \
    "spirootfstype=jffs2\0" \
    "spisrcaddr=0xe0000\0" \
    "spiimgsize=0x362000\0" \
    "spibusno=0\0" \
    "spiargs=setenv bootargs console=${console} " \
    "${optargs} " \
    "root=${spiroot} " \
    "rootfstype=${spirootfstype}\0" \
    "netargs=setenv bootargs console=${console} " \
    "${optargs} " \
    "root=/dev/nfs " \
    "nfsroot=${serverip}:${rootpath},${nfsopts} rw " \
    "ip=dhcp\0" \
    "bootenv=uEnv.txt\0" \
    "loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
    "importbootenv=echo Importing environment from mmc ...; " \
    "env import -t $loadaddr $filesize\0" \
    "ramargs=setenv bootargs console=${console} " \
    "${optargs} " \
    "root=${ramroot} " \
    "rootfstype=${ramrootfstype}\0" \
    "loadramdisk=fatload mmc ${mmcdev} ${rdaddr} ramdisk.gz\0" \
    "loaduimagefat=fatload mmc ${mmcdev} ${kloadaddr} ${bootfile}\0" \
    "loaduimage=ext2load mmc ${mmcdev}:2 ${kloadaddr} /boot/${bootfile}\0" \
    "mmcboot=echo Booting from mmc ...; " \
    "run mmcargs; " \
    "bootm ${kloadaddr}\0" \
    "nandboot=echo Booting from nand ...; " \
    "run nandargs; " \
    "nand read ${loadaddr} ${nandsrcaddr} ${nandimgsize}; " \
    "bootm ${loadaddr}\0" \
    "spiboot=echo Booting from spi ...; " \
    "run spiargs; " \
    "sf probe ${spibusno}:0; " \
    "sf read ${loadaddr} ${spisrcaddr} ${spiimgsize}; " \
    "bootm ${loadaddr}\0" \
    "netboot=echo Booting from network ...; " \
    "setenv autoload no; " \
    "dhcp; " \
    "tftp ${loadaddr} ${bootfile}; " \
    "run netargs; " \
    "bootm ${loadaddr}\0" \
    "ramboot=echo Booting from ramdisk ...; " \
    "run ramargs; " \
    "bootm ${loadaddr}\0" \
    "findfdt="\
    "if test $board_name = A335BONE; then " \
    "setenv fdtfile am335x-bone.dtb; fi; " \
    "if test $board_name = A33515BB; then " \
    "setenv fdtfile am335x-evm.dtb; fi; " \
    "if test $board_name = A335X_SK; then " \
    "setenv fdtfile am335x-evmsk.dtb; fi\0" \

  • 0 回复 jiew
    Intellectual 352 points

    jiew 说：

    Dear Blaider

    1.請問這些命令是要加再uboot 哪邊??

    2.或是有uenv.txt 可以參考??

    3.我看am335x_evm.h 的CONFIG_EXTRA_ENV_SETTINGS

        已經有你列出的命令,請問要如何修改呢??

       (我現在都會固定從mmc 抓取rootfs 然後抓不到)

    #define CONFIG_EXTRA_ENV_SETTINGS \
    "loadaddr=0x80200000\0" \
    "kloadaddr=0x80007fc0\0" \
    "fdtaddr=0x80F80000\0" \
    "fdt_high=0xffffffff\0" \
    "rdaddr=0x81000000\0" \
    "bootfile=uImage\0" \
    "fdtfile=\0" \
    "console=ttyO0,115200n8\0" \
    "optargs=\0" \
    "mtdids=" MTDIDS_DEFAULT "\0" \
    "mtdparts=" MTDPARTS_DEFAULT "\0" \
    "dfu_alt_info_mmc=" DFU_ALT_INFO_MMC "\0" \
    "dfu_alt_info_emmc=rawemmc mmc 0 3751936\0" \
    "dfu_alt_info_nand=" DFU_ALT_INFO_NAND "\0" \
    "mmcdev=0\0" \
    "mmcroot=/dev/mmcblk0p2 ro\0" \
    "mmcrootfstype=ext3 rootwait\0" \
    "nandroot=ubi0:rootfs rw ubi.mtd=7,2048\0" \
    "nandrootfstype=ubifs rootwait=1\0" \
    "nandsrcaddr=0x280000\0" \
    "nandimgsize=0x500000\0" \
    "rootpath=/export/rootfs\0" \
    "nfsopts=nolock\0" \
    "static_ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}" \
    "::off\0" \
    "ramroot=/dev/ram0 rw ramdisk_size=65536 initrd=${rdaddr},64M\0" \
    "ramrootfstype=ext2\0" \
    "ip_method=none\0" \
    "bootargs_defaults=setenv bootargs " \
    "console=${console} " \
    "${optargs}\0" \
    "mmcargs=run bootargs_defaults;" \
    "setenv bootargs ${bootargs} " \
    "root=${mmcroot} " \
    "rootfstype=${mmcrootfstype} ip=${ip_method}\0" \
    "nandargs=setenv bootargs console=${console} " \
    "${optargs} " \
    "root=${nandroot} " \
    "rootfstype=${nandrootfstype}\0" \
    "spiroot=/dev/mtdblock4 rw\0" \
    "spirootfstype=jffs2\0" \
    "spisrcaddr=0xe0000\0" \
    "spiimgsize=0x362000\0" \
    "spibusno=0\0" \
    "spiargs=setenv bootargs console=${console} " \
    "${optargs} " \
    "root=${spiroot} " \
    "rootfstype=${spirootfstype}\0" \
    "netargs=setenv bootargs console=${console} " \
    "${optargs} " \
    "root=/dev/nfs " \
    "nfsroot=${serverip}:${rootpath},${nfsopts} rw " \
    "ip=dhcp\0" \
    "bootenv=uEnv.txt\0" \
    "loadbootenv=fatload mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
    "importbootenv=echo Importing environment from mmc ...; " \
    "env import -t $loadaddr $filesize\0" \
    "ramargs=setenv bootargs console=${console} " \
    "${optargs} " \
    "root=${ramroot} " \
    "rootfstype=${ramrootfstype}\0" \
    "loadramdisk=fatload mmc ${mmcdev} ${rdaddr} ramdisk.gz\0" \
    "loaduimagefat=fatload mmc ${mmcdev} ${kloadaddr} ${bootfile}\0" \
    "loaduimage=ext2load mmc ${mmcdev}:2 ${kloadaddr} /boot/${bootfile}\0" \
    "mmcboot=echo Booting from mmc ...; " \
    "run mmcargs; " \
    "bootm ${kloadaddr}\0" \
    "nandboot=echo Booting from nand ...; " \
    "run nandargs; " \
    "nand read ${loadaddr} ${nandsrcaddr} ${nandimgsize}; " \
    "bootm ${loadaddr}\0" \
    "spiboot=echo Booting from spi ...; " \
    "run spiargs; " \
    "sf probe ${spibusno}:0; " \
    "sf read ${loadaddr} ${spisrcaddr} ${spiimgsize}; " \
    "bootm ${loadaddr}\0" \
    "netboot=echo Booting from network ...; " \
    "setenv autoload no; " \
    "dhcp; " \
    "tftp ${loadaddr} ${bootfile}; " \
    "run netargs; " \
    "bootm ${loadaddr}\0" \
    "ramboot=echo Booting from ramdisk ...; " \
    "run ramargs; " \
    "bootm ${loadaddr}\0" \
    "findfdt="\
    "if test $board_name = A335BONE; then " \
    "setenv fdtfile am335x-bone.dtb; fi; " \
    "if test $board_name = A33515BB; then " \
    "setenv fdtfile am335x-evm.dtb; fi; " \
    "if test $board_name = A335X_SK; then " \
    "setenv fdtfile am335x-evmsk.dtb; fi\0" \

    简单点就是修改一下bootcmd变量，让它自动运行

    bootcmd= run loaduimagefat;run loadramdisk;run ramargs;bootm;

  • 0 回复 blaider wang
    Intellectual 352 points

    简单点就是修改一下bootcmd变量，让它自动运行

    bootcmd= run loaduimagefat;run loadramdisk;run ramargs;bootm ${kloadaddr};

  • 0 回复 Jian Zhou
    Expert 2272 points

    Dear Jian

    ramdisk我早已經建好了

    我是問要如何透過uEnv.txt 或是修改uboot 程式

    使其可以 自動將SD卡boot 分區內的ramdisk.gz 自動mount 當作root file system 

  • 0 回复 jiew
    TI__Mastermind 45260 points

    参考过下面这个guide列出来的步骤和参数吗，可以从NAND或者SD卡启动ramdisk：

    http://processors.wiki.ti.com/index.php/AM335x_U-Boot_User%27s_Guide#Environment_Settings_for_Ramdisk