Date: Wed, 09 Dec 1998 17:19:29 -0800 From: Mike Smith <mike@smith.net.au> To: Chris Ficklin <Chris_Ficklin@serengeti.com> Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: accessing PCI memory under 2.2.2 Message-ID: <199812100119.RAA01687@dingo.cdrom.com> In-Reply-To: Your message of "Wed, 09 Dec 1998 16:49:11 CST." <3.0.32.19981209164910.00a3c9e0@prismnet.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> I'm having difficulty accessing the memory on a PCI adapter I'm writing a > driver for. I map the memory with pci_map_mem and am using the pointer > returned to me in the va parameter. When I try to to write the memory, > what I read back is not the same. Compare your usage with that in other drivers that do memory-mapped I/O. It sounds like you're not necessarily getting it quite right. > I'm using copyin/copyout to write/read > the memory from buffers passed from user space. That's bad; you should use uiomove so that you can be called from kernel space as well. > Also, if I try to access > the memory on the board directly (ie with a printf) the machine locks up. > Does anyone have any ideas what may be wrong. With no actual numbers, hardware documentation, probe output, etc., no, but it's something that you're going to have a better chance of resolving if you look at other code that does the same stuff and compare it with yours. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199812100119.RAA01687>