Re: [B2-devel] Prepare for liftoff...

[<gb...@di...>]

Hi,

> Direct addressing requires VOSF and therefore the configure script
> checks if the system is capable of that.

Initially, it was possible to do without VOSF but it would have required
the same amount of work (blitters, arrangements to the static screen
updates, to the DGA code). Actually, it is faster to go with VOSF
because we have a chance to know exactly which pages of the framebuffer
get modified.

> * TECH file: I think it is worth mentioning those
> - direct addressing
> - real addressing now works under Linux/i386 provided that the
> above-mentioned requirements are met.

Done.

> - VOSF

I don't know where to insert that one. It is partially linked to the
modes of operation since it helps to convert the Mac framebuffer to the
host framebuffer, in direct or real addressing. In virtual addressing,
the "Mac" frame buffer is the host framebuffer because specific memory
access functions are used to handle the different layouts.