diff options
| -rw-r--r-- | man4/cpuid.4 | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/man4/cpuid.4 b/man4/cpuid.4 index bd883e6d3..0b38fabe3 100644 --- a/man4/cpuid.4 +++ b/man4/cpuid.4 @@ -69,7 +69,9 @@ $ modprobe cpuid There is no support for CPUID functions that require additional input registers. .P -Very old x86 CPUs don't support CPUID. +Early i486 CPUs do not support the CPUID instruction; +.\" arch/x86/kernel/cpuid.c cpuid_open() +opening this device for those CPUs fails with EIO. .SH SEE ALSO .BR cpuid (1) .P |