Geode SC1100 i2c bus

[Milan Obuch]

On Sunday 04 February 2007 22:24, Cats wrote:
> I played a bit today with Geode registers.
>
> Well, I tried to tweak the /usr/src/sys/i386/i386/geode.c
>
> *** 198,203 ****
> --- 198,207 ----
>                         * people think their box just died.
>                         */
>                         led_func(&led1b, 1);
> +                         outb(0x2E,0x7); // Select LDN Page 80
> +                       outb(0x2F,0x2); // Put 02h in LDN to select IR Port
> +                       outb(0x2E,0x30); // Select Logical Device Control
> Register +                       outb(0x2F,inb (0x2F)+1); // Set LDCR[0] to
> enable IR port }
>                 if ( strlen(bios_oem) )
>                         printf("Geode %s\n", bios_oem);
>
> After rebooting with the new kernel I got this in the dmesg:
>
> sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
> sio0: type 16550A, console
> sio1: configured irq 3 not in bitmap of probed irqs 0
> sio1: port may not be enabled
> sio1 at port 0x2f8-0x2ff irq 3 on isa0
> sio1: type 16550A
>
> Yes, the IR port is seen as a standard serial port and I have the cuad1*
> and ttyd1* in the /dev
>
> Well of course none of IRRCX1 and IRTX pins are wired on the wrap board, so
> no way to test it.
>
> This might be a trick to enable the ACBbuses on the geode to have them
> recognized by a driver on the isa bus.
>
> Got to try when I'll have some spare time.
>

It will not work, there is much more to do. As shown in your test, even second 
serial will not work because irq routing is not set. But I will try to 
analyze Pascal's sources and compare it to my older work, maybe I can find 
the problem, just wait a bit... I will keep you informed if I achieve any 
progress...
Milan

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