SMA_SIZE and IDE_BOOT_DRIVE on pcchips810

[Alessio Sangalli]

Hi. I was reading the source code but I couldn't fully understand the
meaning of SMA_SIZE and IDE_BOOT_DRIVE in the config file for pchipc 810lmr.

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?

The following code from src/northsouthbridge/sis/730/ipl.S does the FB
activation but I can't figure which values of SMA_SIZE correspond to the
various video ram sizes.

#ifdef HAVE_FRAMEBUFFER
    orb     $SMA_SIZE, %al          # enable SMA 8 MB for VGA
#endif /* HAVE_FRAMEBUFFER */

#else /* !SIZE_ALL */

no_sdram:
#ifdef HAVE_FRAMEBUFFER
          movb    $0x63, %ah              # enable DIMM 0 and
          movb    $(SMA_SIZE + 0x01), %al # enable SMA 8 MB for VGA
#else /* HAVE_FRAMEBUFFER */
          movw    $0x6301, %ax            # enable DIMM 0
#endif /* HAVE_FRAMEBUFFER */

There are some sample config files where SMA_SIZE is set to 0x80, 0x90,
0xA0 - how much video memory is activated?

Similar question for IDE_BOOT_DRIVE. On the sample config files that
come with the code it's always set to '2', but the source
(ide_fill_inbuf.c) would suggest me /dev/hda is '0' - but I'm not sure.

$ grep -r IDE_BOOT_DRIVE .
./src/rom/ide_fill_inbuf.c:#ifndef IDE_BOOT_DRIVE
./src/rom/ide_fill_inbuf.c:#define IDE_BOOT_DRIVE 0
./src/rom/ide_fill_inbuf.c:
ide_read_sector(IDE_BOOT_DRIVE, buffer, block_num,
./util/config/pcchips787.config:option IDE_BOOT_DRIVE=2
./util/config/stpc.config:option IDE_BOOT_DRIVE=2

/dev/hda -> 0
/dev/hdb -> 1
/dev/hdc -> 2
/dev/hdd -> 3

Is it correct???

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

bye bye thank you!!!
as

[Steve Gehlbach]

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

[Alessio Sangalli]

Steve Gehlbach wrote:
> SiS 630 Dev 0 FN 0
> Register 63h DRAM Status Register

So, I hope I've made the correct calculations, I write them here for 
future reference:

SMA_SIZE values for different video ram sizes:

10000000b -> 0x80h (2MB/4MB)
10010000b -> 090xh (4MB/8MB)
10100000b -> 0A0xh (8MB/16MB)
10110000b -> 0B0xh (16MB/32MB)
11000000b -> 0C0xh (32MB/64MB)
11010000b -> 0D0xh (64MB/na)

What I don't understand now is the "double" size value (with the 'not 
supported' value for 0xD0). What does it mean?
> Yes.  Some of us boot from /dev/hdc using CF, then mount /dev/hda0 as
> the root device.

Interesting. But, I was asking to myself... how much time does the 
hard-disk need to spin-up? I've made few tests and it seems quite fast, 
only few seconds. How much time is it possible to gain with a CF ide 
device? I have a small CF card, I should buy the CF-IDE adapter, but I 
have no idea of the advantages it would bring to me.

Thank you for the exceptional work!
bye
as

[ollie lho]

On Thu, 2003-03-13 at 16:44, Alessio Sangalli wrote:
> Steve Gehlbach wrote:
> > SiS 630 Dev 0 FN 0
> > Register 63h DRAM Status Register
>
> So, I hope I've made the correct calculations, I write them here for 
> future reference:
>
> SMA_SIZE values for different video ram sizes:
>
> 10000000b -> 0x80h (2MB/4MB)
> 10010000b -> 090xh (4MB/8MB)
> 10100000b -> 0A0xh (8MB/16MB)
> 10110000b -> 0B0xh (16MB/32MB)
> 11000000b -> 0C0xh (32MB/64MB)
> 11010000b -> 0D0xh (64MB/na)
>
> What I don't understand now is the "double" size value (with the 'not 
> supported' value for 0xD0). What does it mean?

You don't have to care about the double size stuff. Some time in the 
history, there is a feature to add DRAM card for internal VGA. It did
not work out.
> Interesting. But, I was asking to myself... how much time does the 
> hard-disk need to spin-up? I've made few tests and it seems quite fast, 
> only few seconds. How much time is it possible to gain with a CF ide 
> device? I have a small CF card, I should buy the CF-IDE adapter, but I 
> have no idea of the advantages it would bring to me.

For CF/DOM, it is "INSTANT'.