Flashing Bios Success...

[Nathanael Noblet]

On Wednesday, May 7, 2003, at 03:06  PM, ron minnich wrote:
> what is your southbridge part? can you look at the part directly?

So I have the datasheet for the 5595 now (found using google so not 
sure whether I should send it to you) um either way to enable flash 
they talk about using the

"address and data port, i.e. Port 70h and 71h, respectively. The access 
control with which the three portions of registers can be appropriately 
addressed are stored in PCI-ISA: 45h[3] (EXTEND_EN bit) and PCI-ISA: 
45h[1](APCREG_EN bit)."
but in the sis530 docs I get this for registers 70h:

"Register 70h to register 76h define the attribute of the Shadow RAM 
from 640 KBytes to 1
MBytes. All of the registers 70h to 75h are defined as below, and each 
register defines the
corresponding memory segment's attribute which are listed in the 
following table.
REGISTER DEFINED RANGE REGISTER DEFINED RANGE
Register 70h bits 7:5 0C0000h-0C3FFFh Register 73h bits 7:5 
0D8000h-0DBFFFh"

so I'm not sure how to set that in the 5595..? There must be some way 
through the pci bridge I think, but don't really know what I'm doing... 
so some pointers (or even pointers to some docs on how things work) 
would be great.

Register 45h (on the 5595) controls the flash writability. But on the 
sis530 45h is "IDE Secondary Channel/Master Drive Data Active Time 
Control" so again it is a matter of knowing how to communicate with the 
5595 instead of the main chipset.

Now this is all great and what not, but I'm confused. We're having 
problems detecting the flash, not writing to it. So I'm not sure how 
this will help. As well in the flash_rom sources the enable_sis is 
never called.

In going over the sources to devbios and the flash_rom, I realize that 
I don't know anything much about the pci/isa bridges and such...

So basically I'm wondering what the next step is.
1) Does the write enable bit help with detecting?
2) Where do I get docs about how the pci & isa communication happens?
	2a) do I need those docs?

that's about it...

-- 
Nathanael Noblet
Gnat Solutions
4604 Monterey Ave NW
Calgary, AB
T3B 5K4

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C 403.809.5368

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