what's difference of ioscan -u and -k?

[常有慈悲心]

-k:kernel io
-u :usable io?

[Sanjay Kumar Suri · Accepted solution]

-k: Scan kernel I/O system data structures instead of the actual hardware and list the results.

-u: Scan and list usable I/O system devices instead of the actual hardware.

So -k (defined in kernel) could list more I/O system data than -u (what is usable).

sks

[Peter Leddy_1]

-k Scan kernel I/O system data structures instead of the actual hardware and list
the results. No binding or unbinding of drivers is performed. The -d, -C, -I,
and -H options can be used to restrict listings. Cannot be used with -u. This
option does not require superuser privileges.

-u Scan and list usable I/O system devices instead of the actual hardware. Usable
I/O devices are those having a driver in the kernel and an assigned instance
number. The -d, -C, -I, and -H options can be used to restrict listings. The
-u option cannot be used with -k.


You can get this from the manpages(man ioscan).