ASM: operand size mismatch for 'out' error

Question

I'm a beginner in ASM programming and I'm trying to read the PIT count. However the following code generates the error: "operand size mismatch for 'out'". (I'm using AT&T syntax)

movb $0b00000100, %al
outb %al, 0x43

How can I solve it? Thanks for your help!

Actually not, al is the source and 0x43 is the destination port. Problem solved! The following code works: outb %al, $0x43 — user3338395, Feb 21 '14 at 19:04
Well then, answer your own question and accept, or close the question altogether. — Seva Alekseyev, Feb 21 '14 at 22:02
Unfortunately, users with less than 10 reputation can't answer their own question for 8 hours after asking. — user3338395, Feb 21 '14 at 22:24

score 3 · Accepted Answer · answered Feb 22 '14 at 04:04

3

The following code works:

outb %al, $0x43

Thanks.

answered Feb 22 '14 at 04:04

user3338395

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ASM: operand size mismatch for 'out' error

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