From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 25 Jan 2001 11:53:01 -0600 From: Timur Tabi In-Reply-To: <3A7066A1.5030608@valinux.com> References: <3A6D5D28.C132D416@sangate.com> <20010123165117Z131182-221+34@kanga.kvack.org> <20010123165117Z131182-221+34@kanga.kvack.org> ; from ttabi@interactivesi.com on Tue, Jan 23, 2001 at 10:53:51AM -0600 <20010125155345Z131181-221+38@kanga.kvack.org> <20010125165001Z132264-460+11@vger.kernel.org> Subject: Re: ioremap_nocache problem? Message-Id: <20010125175027Z131219-222+40@kanga.kvack.org> Sender: owner-linux-mm@kvack.org Return-Path: To: Jeff Hartmann Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org List-ID: ** Reply to message from Jeff Hartmann on Thu, 25 Jan 2001 10:47:13 -0700 > As in an MMIO aperture? If its MMIO on the bus you should be able to > just call ioremap with the bus address. By nature of it being outside > of real ram, it should automatically be uncached (unless you've set an > MTRR over that region saying otherwise). It's not outside of real RAM. The device is inside real RAM (it sits on the DIMM itself), but I need to poke through the entire 4GB range to see how it responds. > Look at the functions agp_generic_free_gatt_table and > agp_generic_create_gatt_table in agpgart_be.c (drivers/char/agp). They > do the ioremap_nocache on real ram for the GATT/GART table. Unfortunately, the memory they remap is allocated: table = (char *) __get_free_pages(GFP_KERNEL, page_order); ... CACHE_FLUSH(); agp_bridge.gatt_table = ioremap_nocache(virt_to_phys(table), (PAGE_SIZE * (1 << page_order))); CACHE_FLUSH(); I've searched high and low for examples of code that does what I do, and I can't find any. -- Timur Tabi - ttabi@interactivesi.com Interactive Silicon - http://www.interactivesi.com When replying to a mailing-list message, please direct the reply to the mailing list only. Don't send another copy to me. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux.eu.org/Linux-MM/