Changes between Version 21 and Version 22 of venice/firmware

Timestamp:

05/01/2025 05:55:50 PM (4 days ago)

Author:

Tim Harvey

Comment:

added script to determine emmc boot partition, adjust default boot partition, and include making boot0 writeable

venice/firmware

@@ -200 +200 @@
 
 ==== Boot firmware update via Linux
-Updating the boot firmware via Linux requires you to manually determine the correct device, hardware partition and offset:
+Updating the boot firmware via Linux requires you to manually specify the correct device, hardware partition and offset.
+
+To determine the current eMMC hardware boot partition you need to look at the PARTITION_CONFIG(EXT_CSD![179]) register bits ![5:3] 'BOOT_PARTITION_ENABLE' where 1='Boot Partition 1' (we call this boot0) 2='Boot Partition 2' (we call this boot1) and 7=User area (we call this user).
+
+Here is a set of bash commands in Linux that will use {{{mmc}}} (from the {{{mmc-utils}}} package) to read the CSD, decode the value and display the names we use to refer to the boot partition:
+{{{#!bash
+PARTITION_CONFIG=$(mmc extcsd read /dev/mmcblk2 | grep PARTITION_CONFIG | grep -o "0x[0-9a-fA-F]\+")
+BOOT_PARTITION_ENABLE=$(( $(( $((PARTITION_CONFIG)) & 0x38 )) >> 3)) # convert hex to dec and mask off bits[5:3] and shift
+case $BOOT_PARTITION_ENABLE in
+  1) echo boot0;; # Boot partition 1
+  2) echo boot1;; # Boot partition 2
+  7) echo user;; # User area
+esac
+}}}
+
  * for IMX8M Mini board variants:
+  - with boot firmware in boot0 hardware partition (default):
+{{{#!bash
+# allow writing to boot0
+echo 0 > /sys/block/mmcblk2boot0/force_ro
+# write to the emmc device to 33K offset
+dd if=venice-imx8mm-flash.bin of=/dev/mmcblk2boot0 bs=1K seek=33
+}}}
   - with boot firmware in user hardware partition:
 {{{#!bash
@@ -207 +228 @@
 dd if=venice-imx8mm-flash.bin of=/dev/mmcblk2 bs=1K seek=33
 }}}
+ * for IMX8M Nano board variants:
   - with boot firmware in boot0 hardware partition:
 {{{#!bash
-# write to the emmc device to 33K offset
-dd if=venice-imx8mm-flash.bin of=/dev/mmcblk2boot0 bs=1K seek=33
-}}}
- * for IMX8M Nano board variants:
+# allow writing to boot0
+echo 0 > /sys/block/mmcblk2boot0/force_ro
+# write to the emmc device to 0K offset
+dd if=venice-imx8mn-flash.bin of=/dev/mmcblk2boot0 bs=1K seek=0
+}}}
   - with boot firmware in user hardware partition:
 {{{#!bash
@@ -218 +241 @@
 dd if=venice-imx8mn-flash.bin of=/dev/mmcblk2 bs=1K seek=32
 }}}
-  - with boot firmware in boot0 hardware partition:
-{{{#!bash
+ * for IMX8M Plus board variants:
+  - with boot firmware in boot0 hardware partition (default):
+{{{#!bash
+# allow writing to boot0
+echo 0 > /sys/block/mmcblk2boot0/force_ro
 # write to the emmc device to 0K offset
-dd if=venice-imx8mn-flash.bin of=/dev/mmcblk2boot0 bs=1K seek=0
-}}}
- * for IMX8M Plus board variants:
+dd if=venice-imx8mp-flash.bin of=/dev/mmcblk2boot0 bs=1K seek=0
+}}}
   - with boot firmware in user hardware partition:
 {{{#!bash
 # write to the emmc device to 32K offset
 dd if=venice-imx8mp-flash.bin of=/dev/mmcblk2 bs=1K seek=32
-}}}
-  - with boot firmware in boot0 hardware partition:
-{{{#!bash
-# write to the emmc device to 0K offset
-dd if=venice-imx8mp-flash.bin of=/dev/mmcblk2boot0 bs=1K seek=0
 }}}