EPIA-M serial port 1/2 baud rate insanity

[Dave Ashley]

Andrew Ip wrote:
>Have you checked out the clock connected to LPC?  On W311, FS2 can be
>set to 24 or 48 MHz.  It could be the problem, since I have similar problem
>with USB on a custom cle266 board.  FYI, it can be programmed thru smb.  
>Here is from we have done to program the USB clock.
>...
>You may want to put similar code in serial init.  Hope this help.

I tried this and...it worked! My simple test program is below. Linuxbios
puts the smb stuff at 0xf00 and it is already enabled (at least in my patch).
So all I had to do was do the outb's to get it to work. Thanks *very* much.

Note to Ron: Let me know if you want the epia-m, I'll still send one off if
you want it. I've got a spare 10000 (1 gig) that you can have. Note I
don't read email sent to the address I'm posting from...best send to
dash at xdr.com to get to me.

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/io.h>
#include <stdlib.h>

#define  SMB_STATUS             (base + 0)
#define  SMB_CONTROL            (base + 2)
#define  SMB_COMMAND            (base + 3)
#define  SMB_ADDRESS            (base + 4)
#define  SMB_DATA               (base + 5)

#define  I2C_TRANS_CMD          0x40
#define  CLOCK_SLAVE_ADDRESS    0x69


int main(int argc, char **argv)
{
int res;
int base=0xf00;

        res=iopl(3);
        if(res)
        {
                perror("iopl");
                exit(-1);
        }

        outb( 0xff, SMB_STATUS );

        // USB out 48MHz
        outb( 0x7f, SMB_DATA );
        outb( 0x83, SMB_COMMAND );
        outb( (CLOCK_SLAVE_ADDRESS<<1), SMB_ADDRESS );
        outb( 0x8|I2C_TRANS_CMD, SMB_CONTROL );

        while( inb(SMB_STATUS) & 0x01 );

}


-Dave