Date: Thu, 13 Aug 1998 21:58:03 -0400 From: "Louis A. Mamakos" <louie@TransSys.COM> To: Roger Hardiman <roger@cs.strath.ac.uk> Cc: Scott Mitchell <scott@dcs.qmw.ac.uk>, multimedia@FreeBSD.ORG Subject: Re: FXTV and DGA Message-ID: <199808140158.VAA11299@whizzo.transsys.com> In-Reply-To: Your message of "Thu, 13 Aug 1998 17:16:48 BST." <35D31170.2781@cs.strath.ac.uk> References: <35D2E663.7AF0@cs.strath.ac.uk> <19980813160216.B6924@dcs.qmw.ac.uk> <35D31170.2781@cs.strath.ac.uk>
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> Scott > > > > This may be a dumb suggestion (I don't use fxtv so I have no idea if > > this will work or not), but couldn't the driver be made into an LKM? > > Funny you should mention it, but Amancio, Randall and later myself > talked about this around 8 months ago. > > The problem was basically this. > You need to allocate configuous memory for the frame buffer. > > At boot time, this is easy. Memory is empty and you can allocate > a 864k block of memory with no gaps in it. > However, I was told that by the time the system has booted, > and the LKM executed, there is quite possible you cannot get a > contiguous block of memory as the memory is fragmented. > > Basically, you need a memeory manager that can shift memory blocks > around making a large space. > > I was told the current memory management code cannot do this. > > > But if we could do it, then the LKM would be great. The alternative approach is to allocate some number of smaller (pagesize?) buffers, and then build a command program for the Bt848 to do a scatter read into the discountinuous buffers. This might obviate the need for a static buffer in any case. louie To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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