EPIA Howto Update
mwilkinson at ndirect.co.uk
Fri Jul 18 02:08:00 CEST 2003
Thanks for the comments, looks like an update to the update will be on it's
way shortly !
On Friday 18 Jul 2003 05:56, SONE Takeshi wrote:
> On Fri, Jul 18, 2003 at 01:29:48AM +0100, Mark Wilkinson wrote:
> > Just a quick note to say that I've updated my EPIA howto to include a
> > little section for the brave on enabling the onboard VGA.
> > This is based on Sone Takeshi's work.
> > Thanks to Andrew Ip for committing the update to CVS.
> Hi Mark,
> Thank you for your work.
> Perhaps everyone already forgets about it, but I was asked by Ron
> for a HOWTO on EPIA+VGA.
> I started it, but it isn't finished. (I was fiddling with BOOT_IDE etc
> to include in my documentation...)
> Now that your HOWTO covers VGA, everything is OK.
> Some points...
> - Line 37-40:
> NOTE: At present, the epia can be booted with a serial console. Power
> management to turn off the power is not available, neither is the
> video bios. Memeory is currenly hard coded to report 64M - you must
> have at least this much memory.
> You can use video console once VGA is enabled (option VIDEO_CONSOLE=1).
> It isn't very useful however, since VGA initialization is almost at the
> end of LinuxBIOS execution.
> Memory configuration is also fixed already.
Oops, forgot all about the memory configuration being fixed, and I haven't had
a chance to play with the VIDEO_CONSOLE=1 option yet (old story about not
being enough hours in the day... :-)
> - Line 364-367:
> 0 - Disable Framebuffer
> 1 - 1 Mbyte
> 2 - 2 Mbytes
> 8 - 8 Mbytes
> This is incorrect. Valid values are 2, 4, and 8 (MB).
> To disable framebuffer, remove the option HAVE_FRAMEBUFFER.
Will correct that, although what I can remember from the northbridge docs is
that a setting of 0 also disables the framebuffer - perhaps this option is
really a 'have framebuffer, but don't share with it memory option'
> Also, now I use folowing lines in the config for the VGA BIOS image to be
> patched in the romimage:
> option ZKERNEL_START=0xfffc0000
> option VGABIOS_START=0xfffe0000
> addaction romimage dd if=/path/to/vgabios.bin of=romimage bs=65536 \
> seek=2 conv=sync conv=notrunc
> This way you don't have to handcraft the vga+eb payload.
so this copies the vgabios into the rom image after the payload (not the
otherway around) doesn't copying 65536 bytes to 0xfffe000 overwrite the
Linuxbios part of the rom image ? or is that done afterwards, in which case
the LinuxBIOS would overwrite part of the vgabios image... althought, I think
the VGA bios is only 48K in size isn't it !
I'll have to try this, just to get my head around what's happening !
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