Differences

This shows you the differences between two versions of the page.

--- products:sbc:common:development:erase-emmc [2022/07/05 04:19]
nick created
+++ products:sbc:common:development:erase-emmc [2024/04/24 03:23] (current)
ivan [Serial Mode (For developers)]
@@ Line 1: / Line 1: @@
 ====== Erase eMMC ======
+===== Introduction =====
+This document mainly introduces the method of clearing eMMC. You will learn about 3 methods to clear eMMC.
+<WRAP important >
+The operation of VIM1, VIM2 and VIM3 is almost the same, so this document will take VIM3L as an example.
+</WRAP>
+===== Erase Method =====
+<tabbox Serial Mode (For developers)>
+  * Refer to this [[products:sbc:common:development:setup-serial-tool|guide]] to setup the Serial Tool for your VIM.
+  * Once again, ensure you’ve done the correct connections and setup.
+  * Hit any keys at the moment of bootup to stop autoboot. This step will make your VIM enter into u-boot mode.
+  * Type ''store erase boot'' on the terminal of u-boot, and wait for the erasure process to complete.
+  * Type reboot or press the ''Reset'' button.
+  * Use the following as a reference:
+```shell
+kvim3#store init 3
+XXXXXXX======enter EMMC boot======XXXXXX
+co-phase 0x1, tx-dly 0, clock 40000000
+co-phase 0x1, tx-dly 0, clock 40000000
+co-phase 0x3, tx-dly 0, clock 400000
+emmc/sd response timeout, cmd8, cmd->cmdarg=0x1aa, status=0x3ff2800
+emmc/sd response timeout, cmd55, cmd->cmdarg=0x0, status=0x3ff2800
+co-phase 0x3, tx-dly 0, clock 400000
+co-phase 0x1, tx-dly 0, clock 40000000
+[set_emmc_calc_fixed_adj][860]find fixed adj_delay=20
+init_part() 297: PART_TYPE_AML
+[mmc_init] mmc init success
+switch to partitions #0, OK
+mmc1(part 0) is current device
+Device: SDIO Port C
+Manufacturer ID: 15
+OEM: 100
+Name: AJTD4
+Tran Speed: 52000000
+Rd Block Len: 512
+MMC version 5.1
+High Capacity: Yes
+Capacity: (0x3a3e00000 Bytes) 14.6 GiB
+mmc clock: 40000000
+Bus Width: 8-bit
+[store]amlmmc erase 1emmckey_is_protected(): protect
+bootloader partition is erased: start = 0x0,end = 0x1fff
+reserved   partition is protected
+env        partition is erased: start = 0x36000,end = 0x39fff
+rootfs     partition is erased: start = 0x3e000,end = 0x1d1efff
+Erasing blocks 0 to 8192 @ boot0
+start = 0x0,end = 0x1fff
+Erasing blocks 0 to 8192 @ boot1
+start = 0x0,end = 0x1fff
+```
+<tabbox Interrupt Mode>
+This approach is suitable for all products that use the Amlogic SoC:
+  * Carry out normal upgrading via [[start|USB-C Cable]] or [[/products/sbc/common/install-os/install-os-into-external-storage|TF Card]].
+  * Manually interrupt the upgrading process (forcefully disconnect after 15% is recommended). For example, unplug the USB-C cable or the TF card.
+  * Power on your VIM again, and you’ll find that all the data on the eMMC has been erased.
+<tabbox CLI Mode>
+This approach is suitable for a VIM that has Linux installed:
+Power on and boot up.
+Open a terminal, and run ''dd'' to fill your bootloader partition with zeros:
+```shell
+root@Khadas:~# 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>

Khadas Docs

User Tools

Site Tools

Differences

Page Tools