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Maix-IV Series Frequently Asked Questions (FAQ)

1. Q: How to check the SDK version of the current system?#

A: Run the command cat /proc/ax_proc/version. Example output:

root@ax650:~# cat /proc/ax_proc/version
Ax_Version V1.45.0_P39_20240830020829

2. Q: After updating to v1.45.0_P39, the root filesystem is smaller than 5GB. How to expand it?#

A: Before expansion:

root@ax650:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root       4.9G  4.3G  336M  93% /

After expansion:

root@ax650:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root        15G  4.3G  9.6G  31% /

Steps:

  1. Identify whether the system boots from TFCard or eMMC: 
    root@ax650:~# grep -oP 'root=\K\S+' /proc/cmdline
/dev/mmcblk1p2 # TFCard 启动
# /dev/mmcblk0p2 # 或 eMMC 启动
  2. Replace /dev/mmcblkX in the following commands with the detected device (e.g., /dev/mmcblk0 or /dev/mmcblk1), then execute: 
    parted /dev/mmcblkX resizepart 2 100%
resize2fs /dev/mmcblkXp2
sync

Q: After updating to v1.45, the root filesystem only shows 8GB. How to fix this?

A: This occurs when booting after the first flash. The eMMC partition is pre-configured for maximum capacity. Run the following to update filesystem metadata (post-expansion size should be 28GB):

resize2fs /dev/mmcblk0p10  
sync  # Critical! Prevents boot failure after power cycle.

Expected result:

root@maixbox:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/root        28G  6.0G   21G  23% /

Warning: Always run sync before rebooting/power-off to avoid system corruption.

3. Q: How to resolve network conflicts caused by duplicate MAC addresses?#

A: Permanently modify MAC addresses via U-Boot environment variables:

# 例如
setenv ethaddr d0:00:00:00:00:01
setenv eth1addr d0:00:00:00:00:02
saveenv

4. Key Notes:#

  • For eMMC operations, ensure sync is executed to prevent data loss.

  • MAC address changes require saveenv to persist across reboots.

  • Refer to official docs for advanced partitioning scenarios.

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