From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3A9A8976.884C49C2@mvista.com> Date: Mon, 26 Feb 2001 11:51:02 -0500 From: Dan Malek MIME-Version: 1.0 To: Steve Ferri CC: "Linuxppc-Embedded (E-mail)" Subject: Re: Cache Inhibit on 860? References: Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Steve Ferri wrote: > Is there a way to alloc memory and mark it as cache inhibited ? In a few minutes :-). I finally created a common set of 'dma_consistent' functions for 8xx and 4xx (and anything else that may need them) based upon implementations from other architectures. I am now checking this into the linuxppc_2_5 BitKeeper tree. > This would eliminating the need for the invalidate and flush calls. But, if you already have this working, it is probably better performance unless these are tiny, frequently used buffers. > ..... I am > currently > running a 2.2.14 version of the kernel on an 860 processor. For 2.2.14, look at the arch/ppc/8xx_io/enet.c Ethernet driver as an example. It calls __get_free_page(), then tracks down the page table entry and sets the cache inhibit flag. Do the same thing in your driver. The stuff done in 'commproc.c' is different because it is called earlier in the kernel. -- Dan ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/