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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
@@ Line 1: / Line 1: @@
-====== Erase eMMC ======
+====== VIM4 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:sbc:vim4:development:setup-serial-tool|Serial Debug Tool]].
+  - As the SBC is booting-up, press ''SPACE''on the keyboard to enter the U-Boot mode.
+  - Type ''store boot_erase bootloader'' into the U-Boot console, and wait for the erasure process to complete.
+  - After erasure is completed, type ''reboot'' or press the ''RESET'' button on your SBC.
+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
+blocks erased: OK
+Caution! Your devices Erase group is 0x400
+The erase range would be change to 0x0~0x23ff
+blocks erased: OK
+Caution! Your devices Erase group is 0x400
+The erase range would be change to 0x0~0x23ff
+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:BL:055c20;ID:7CFDCF5E6052BDEC;FEAT:30F:1FFF0000:B002F:1;POC:CF;RCY:0;OVD:0;DFU:0;SD:2002;eMMC:0;RD-0:0;CHK:1;RD-1:0;CHK:1;RD-2:0;CHK:1;SPINOR:0;RD-0:0;CHK:1;RD-1:0;CHK:1;USB:ADFU�T7:BL:055c20;ID:7CFDCF5E6052BDEC;FEAT:30F:1FFF0000:B002F:1;POC:CF;RCY:0;OVD:0;DFU:1;USB:0;RD-00:0;
+```
+<tabbox Interrupt Mode>
+This erasure method is suitable for all products that use the Amlogic SoC:
+  - Carry out eMMC flashing via a [[products:sbc:vim4:install-os:install-os-into-emmc-via-usb-tool|USB-C cable]].
+  - 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 ''dd'' to fill your bootloader partition with zeros:
+```sh
+khadas@Khadas:~$ sudo dd if=/dev/zero of=/dev/bootloader
+dd: writing to '/dev/bootloader': No space left on device
++0 records in
++0 records out
+4194304 bytes (4.2 MB, 4.0 MiB) copied, 1.1226 s, 3.7 MB/s
+root@Khadas:~# reboot
+```
+</tabbox>

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