SMA_SIZE and IDE_BOOT_DRIVE on pcchips810

Steve Gehlbach steve at nexpath.com
Wed Mar 12 16:44:01 CET 2003


Alessio Sangalli wrote:

> SMA_SIZE should set the amount of framebuffer memory; but which are the
> possible values? How can I set the minimum, or 8MB, or 64MB?
> 
SiS 630 Dev 0 FN 0
Register 63h DRAM Status Register

Bit 7 =1 enable, =0 disable, shared memory

Bits[6:4] Size (Total Share memory size for 128 bit mode)
Shared Memory Size on DIMM0
000   2M   4M
001   4M   8M
010   8M   16M
011   16M  32M
100   32M  64M
101   64M  Not Supported
Others : Reserved

Bit 3: reserved
Bit 2: DIMM2 installed =1, absent =0
Bit 1: DIMM1 "
Bit 0: DIMM0 "

> /dev/hda -> 0
> /dev/hdb -> 1
> /dev/hdc -> 2
> /dev/hdd -> 3
> 
> Is it correct???

Yes.  Some of us boot from /dev/hdc using CF, then mount /dev/hda0 as 
the root device.

> 
> P.S. Is it possible to boot from a CDROM?

Not sure, probably not.

-Steve




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