Don Stanley has just reported to me that if he runs my pcisetup program
first, then the EPP mode of his Atom motherboard appears to work!
Looking at the code in hal_ppmc.c, it checks first to make sure the
high register area of the parallel port exists before writing to the
configuration register.
port_addr[busnum] = port_registration[busnum].base;
if(port_registration[busnum].base_hi)
rtapi_outb(0x80, port_registration[busnum].base_hi + 2);
But, the pcisetup program just blindly writes to the register, without
checking.
So, it appears that the port is, in fact, EPP capable, and the high
registers
do exist and function, despite the port info in the kernel saying they DON'T
exist.
The code in hal_ppmc.c doesn't perform the EPP setup because it has been
told the registers don't exist.
Any ideas what we should do about this? Any idea whether this is a BIOS
error or a Linux port enumeration error?
Jon
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