Changes between Version 18 and Version 19 of venice/boot

Timestamp:

05/01/2025 05:59:14 PM (8 weeks ago)

Author:

Tim Harvey

Comment:

improve script to determine emmc boot device

venice/boot

@@ -79 +79 @@
   - from Linux:
 {{{#!bash
-root@jammy-venice:~# mmc extcsd read /dev/mmcblk2 | grep PARTITION_CONFIG
-Boot configuration bytes [PARTITION_CONFIG: 0x08]
-root@jammy-venice:~# echo $(($((0x08 >> 3)) & 0x7)) # show bits[5:3]
-1
-root@jammy-venice:~# echo $(($(( $(mmc extcsd read /dev/mmcblk2 | sed -n 's/.*PARTITION_CONFIG: \(.*\)]/\1/p') >> 3)) & 0x7)) # 1-line version
-1
-}}}
-  - BOOT_PARTITION_ENABLE is represented by {{{bits[5:3]}}} of PARTITION_CONFIG which can be read from the EXT CSD register 179 named 'PARTITION_CONFIG' (1=boot0, 2=boot1, 7=user)
+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
+}}}
  * IMX8MM: Program boot firmware to user:
   - from U-Boot