OpenBSD安装Shell中USB设备已识别但/dev目录未生成对应节点的求助

Hey there, let's work through this USB device issue you're hitting during your OpenBSD 7.3 install—total bummer when the system sees your drive but you can't actually access it to grab that firmware, right?

First, let's recap what we know: your dmesg confirms the system recognizes the SanDisk Cruzer Blade as sd1, but the /dev node isn't showing up. Here are some troubleshooting steps to try:

• Double-check the /dev directory with a targeted listing
  Sometimes it's easy to miss the device when scrolling through a long directory list. Run this command to filter only SD-related devices:

  ls /dev/sd*
  

  This will show all disk devices starting with sd—if sd1 exists, it should pop up here. Since your USB is FAT32, it likely has at least one partition, so you might see something like sd1a (for an MBR partition) or sd1i (for a GPT EFI partition) instead of just sd1.

• Trigger a devfs rescan to force node creation
  OpenBSD's devfs might not always auto-create the node immediately after device detection. Try running this command to rescan the device tree:

  devctl rescan
  

  After running it, re-run the ls /dev/sd* command to see if the node shows up now.

• Verify the disk's partition structure
  If the disk node exists but you can't find the partition, use fdisk to check the partition table on sd1:

  fdisk sd1
  

  This will show you all partitions on the USB drive. Look for the one labeled as FAT32 (it'll show a type code like 0b or 0c for MBR, or ef00 for GPT EFI). Once you have the partition identifier (like a for the first MBR partition), you can mount it with:

  mkdir -p /mnt
  mount -t msdos /dev/sd1a /mnt
  

  Replace sd1a with your actual partition node if it's different.

• Check for disk initialization issues
  In rare cases, the installer might not fully initialize the disk device. Try manually attaching it with:

  devctl attach sd1
  

  Then check /dev again for the node.

Once you can mount the USB drive, you'll be able to copy the iwm firmware files to /etc/firmware as needed. Let me know if any of these steps work, or if you hit new errors!

备注：内容来源于stack exchange，提问作者Valiant