echo 0 > /sys/block/mmcblk0boot1/force_ro. 关闭写: echo 1 > /sys/block/mmcblk0boot1/force_ro. 在重启之后,force_ro会恢复为1。 2.2 内核force_ro实现. 下面来看看force_ro是如何起作用的? eMMC在被初始化的时候,调用mmc_blk_probe(),这里面会在每个设备下创建force_ro sysfs节点。
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[ 0.303297] io scheduler noop registered [ 0.303324] io scheduler deadline registered [ 0.303763] io scheduler cfq registered (default) 三つのschedulerは起動時に登録されており、後はruntimeで変更可能です。.configでの設定は起動時にどれをdefaultにするかだけの問題です。

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  • I search online and found that we have to do 'saveenv' once to let this error go away. So I did saveenv but after that the board doesn't boot completely and So, my question is how can I change the u-boot code to modify it to read and save environment variables on /dev/block/mmcblk0boot0 instead of...
  • echo 0 > /sys/class/block/mmcblk0boot0/force_ro. The Linux mmc application from the mmc-utils package provides access to eMMC configuration through CSD registers. The User area has its own block pool for wear leveling therefore it would be unaffected by overuse of Boot0/Boot1.

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I simply copied files created in /boot folder over those on mmcblk0p1 partition. Also, I changed config.txt After reboot, result of uname-r command was 3.18.-trunk-rpi instead of 3.12.0-rpi which I had before Can anyone explain me, please - if there is no mmcblk0p2 in fstab why its mounted anyway?

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For convenience, here are relevant bits of old /boot/boot.scr: .---- setenv bootcmd "fatload mmc 0:1 0x40008000 zImage; fatload mmc 0:1 0x42000000 uInitrd; bootm 0x40008000 0x42000000" setenv bootargs "console=tty1 console=ttySAC1,115200n8 root=UUID=e139ce78-9841-40fe-8823-96a304a09859 rootwait ro mem=2047M" `---- If boot fails, type the ...

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Unlock EMMC boot0 block: echo 0 > /sys/block/mmcblk0boot0/force_ro Program preloader to EMMC boot0 block: dd if=mtk-bpi-r2-EMMC.img of=/dev/mmcblk0boot0 bs=1M count=1 Change the Partition configurion of EMMC is 48h: reboot the system which is running SD, and enter the U-boot command line, run command emmc pconf 48

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systemd-analyze Startup finished in 3.245s (kernel) + 5.644s (userspace) = 8.890s. systemd-analyze blame 2.364s [email protected] 599ms systemd-udev-trigger.service 529ms systemd-remount-fs.service 484ms systemd-vconsole-setup.service 474ms kmod-static-nodes.service 450ms systemd-sysctl.service 416ms dev-mqueue.mount 264ms systemd-user-sessions.service 263ms haveged.service 196ms systemd ...

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[email protected]:~# echo 0 > /sys/block/mmcblk0boot0/force_ro [email protected]:~# dd if=u-boot.imx of=/dev/mmcblk0boot0 bs=512 seek=2 [ 222.394014] mmcblk0boot0: unknown partition table

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Partition table get from SPL is : name offset size flag ===== ===== 0: bootloader 0 400000 0 1: reserved 2400000 4000000 0 2: cache 6c00000 20000000 2 3: env 27400000 800000 0 4: logo 28400000 2000000 1 5: recovery 2ac00000 2000000 1 6: rsv 2d400000 800000 1 7: tee 2e400000 800000 1 8: crypt 2f400000 2000000 1 9: misc 31c00000 2000000 1 10 ...

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/sys/block/mmcblk0 (filtered): alignment_offset bdi capability dev device discard_alignment ext_range force_ro holders inflight integrity mmcblk0boot0 mmcblk0boot1 mmcblk0p1 mmcblk0p2 mmcblk0p3 mmcblk0p4 mmcblk0p5 mmcblk0p6 mmcblk0p7 mmcblk0rpmb power queue range removable ro size slaves stat subsystem trace uevent

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Are you sure this will recreate the mmcblk0boot0 partition? It is hard to find info on it but it seemed to be a special hardware partition along with mmcblk0boot1. Most info found by google for these partitions is how to load info into them but not how...

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