[Soekris] Error LED on 4801

[ajv]

Hello,

I am programming the 4801 in assembler under Linux (Slax)
Can you point me to a document or provide me with a piece of code
written in assembler using direct port I/O (not using a kernel driver)
to switch the error LED on and off?

cat/proc/ioports shows : 6100-612B NatSemi SCx200 GPIO
I assume I can use inb and outb into this region?

Thanks in advance.