Loading OS from Flash ROM.

[John Praveen]

    I am new to linux bios. My project is based on geode chip. I want my linux OS to be in Flash ROM(capacity 4 MB). I saw the HOW-TO for Sis based on DiskOnChip. What I have to modify and what other information i have to add if I want to boot from Flash ROM into SDRAM. 
  
Please help.
Thanks.
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Re: Loading OS from Flash ROM.

[ron minnich]

On Fri, 18 Jul 2003, John Praveen wrote:

> I am new to linux bios. My project is based on
> geode chip. I want my linux OS to be in Flash ROM(capacity 4 MB). 

I have sad news. You can't get a 4 MB chip on that board, I bet. It is 
probably 4 Mbits, 512 KB. You'll have to put that overweight linux kernel 
on a diet to get it to fit in there. 

One option is 2.4.0 or so, that might fit.

Can DoC fit on your geode anywhere?

ron

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Re: Loading OS from Flash ROM!

[Bari Ari]

John Praveen wrote:

On Fri, 18 Jul 2003, John Praveen wrote:

> I am new to linux bios. My project is based on
> geode chip. I want my linux OS to be in Flash ROM(capacity 4 MB).
>I have sad news. You can't get a 4 MB chip on that board, I bet.

   I can't get to this. This means that 4 MB Flash ROM cannot 
be used with SC1200? Or is it not supported in LinuxBIOS. Plz help me 
to understand these.

The SC1200 can address up to 16MB of memory on the ISA bus (which is 
where the Flash Rom would be located for the BIOS if strapped for ISA 
BIOS ROM seek after reset) or it can use the LPC bus (if strapped for 
LPC BIOS ROM seek after reset). This is what the SC1200 is capable of if 
you're designing your own board. It's just unlikely that if you're using 
an off the shelf board that it will support >2MB of flash ROM on ISA. If 
it uses an LPC ROM then it's probably soldered down and a 2MB device. 
LinuxBIOS can support a 4MB device or up to a 4GB flash ROM (if they 
actually existed).

>It is
>probably 4 Mbits, 512 KB. You'll have to put that overweight linux 
kernel
>on a diet to get it to fit in there.

>One option is 2.4.0 or so, that might fit.

>Can DoC fit on your geode anywhere?

No I don't use DiskOnChip.

Thanks.


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Re: Loading OS from Flash ROM!

[Bari Ari]

Bari Ari wrote:

John Praveen wrote:

On Fri, 18 Jul 2003, John Praveen wrote:

> I am new to linux bios. My project is based on
> geode chip. I want my linux OS to be in Flash ROM(capacity 4 MB).
>I have sad news. You can't get a 4 MB chip on that board, I bet.

   I can't get to this. This means that 4 MB Flash ROM cannot 
be used with SC1200? Or is it not supported in LinuxBIOS. Plz help me 
to understand these.

The SC1200 can address up to 16MB of memory on the ISA bus (which is 
where the Flash Rom would be located for the BIOS if strapped for ISA 
BIOS ROM seek after reset) or it can use the LPC bus (if strapped for 
LPC BIOS ROM seek after reset). This is what the SC1200 is capable of 
if you're designing your own board. It's just unlikely that if you're 
using an off the shelf board that it will support >2MB of flash ROM on 
ISA. If it uses an LPC ROM then it's probably soldered down and a 2MB 
device. LinuxBIOS can support a 4MB device or up to a 4GB flash ROM 
(if they actually existed). 
Sorry about the typos. (MB megabyte vs Mb megabit) That last sentence 
should be:

It's just unlikely that if you're using an off the shelf board that it 
will support >2Mb of flash ROM on ISA. If it uses an LPC ROM then it's 
probably soldered down and a 2Mb device. LinuxBIOS can support a 4MB 
device or up to a 4GB flash ROM (if they actually existed).

-Bari

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