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products:sbc:vim4:development:erase-emmc [2022/06/29 22:01] 127.0.0.1 external edit |
products:sbc:vim4:development:erase-emmc [2022/09/05 04:15] (current) nick |
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- | ====== Erase eMMC ====== | + | ====== |
+ | There are three methods to erase the eMMC: | ||
+ | |||
+ | * Serial Mode (Developers) | ||
+ | * Interrupt Mode | ||
+ | * CLI Mode | ||
+ | |||
+ | <tabbox Serial Mode (Developers)> | ||
+ | |||
+ | - Connect your PC to the SBC using a [[products: | ||
+ | - As the SBC is booting-up, press '' | ||
+ | - Type '' | ||
+ | - After erasure is completed, type '' | ||
+ | |||
+ | Use the following serial Terminal print-out as a reference: | ||
+ | |||
+ | ```shell | ||
+ | kvim4# store boot_erase bootloader | ||
+ | GUID Partition Table Header signature is wrong: 0x0 != 0x5452415020494645 | ||
+ | GUID Partition Table Header signature is wrong: 0x0 != 0x5452415020494645 | ||
+ | gpt is invalid | ||
+ | |||
+ | |||
+ | Caution! Your devices Erase group is 0x400 | ||
+ | The erase range would be change to 0x0~0x23ff | ||
+ | |||
+ | 8191 blocks erased: OK | ||
+ | |||
+ | |||
+ | Caution! Your devices Erase group is 0x400 | ||
+ | The erase range would be change to 0x0~0x23ff | ||
+ | |||
+ | 8191 blocks erased: OK | ||
+ | |||
+ | |||
+ | Caution! Your devices Erase group is 0x400 | ||
+ | The erase range would be change to 0x0~0x23ff | ||
+ | |||
+ | 8191 blocks erased: OK | ||
+ | kvim4# reboot | ||
+ | ``` | ||
+ | |||
+ | If the eMMC has been erased, the serial Terminal should show this print-out when your SBC powers-on: | ||
+ | |||
+ | ```txt | ||
+ | T7: | ||
+ | ``` | ||
+ | |||
+ | <tabbox Interrupt Mode> | ||
+ | |||
+ | This erasure method is suitable for all products that use the Amlogic SoC: | ||
+ | |||
+ | - Carry out eMMC flashing via a [[products: | ||
+ | - Manually interrupt the upgrading process (forcefully disconnect after 15% is recommended). For example, unplug the USB-C cable or eject the TF card. | ||
+ | - Power on your SBC again, and you'll find that all the data on the eMMC has been erased. | ||
+ | |||
+ | <tabbox CLI Mode> | ||
+ | |||
+ | This erasure method is suitable for the SBC with Linux installed: | ||
+ | |||
+ | - Power on and boot up. | ||
+ | - Open a Terminal, and run '' | ||
+ | |||
+ | ```sh | ||
+ | khadas@Khadas: | ||
+ | dd: writing to '/ | ||
+ | 8193+0 records in | ||
+ | 8192+0 records out | ||
+ | 4194304 bytes (4.2 MB, 4.0 MiB) copied, 1.1226 s, 3.7 MB/s | ||
+ | root@Khadas: | ||
+ | ``` | ||
+ | </ |