From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rafal Jaworowski Date: Fri, 29 Feb 2008 18:10:10 +0100 Subject: [U-Boot-Users] Regarding Dcache Flush in MPC85xx In-Reply-To: References: <47C44CA9.6010906@gdatech.co.in> Message-ID: <47C83C72.6060005@semihalf.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Kumar Gala wrote: >> We are using MPC8555 processor and uboot 1.1.4 both the uboot and >> linux >> was up. Now we plan to port QNX, we are facing following issues. >> >> 1. Qnx is not jumping to the startup location. After giving go >> command >> control is still in the uboot only. >> >> 2. When searching in the mailling list we came to know qnx required >> to >> flush the Data Cache before disabling it in the uboot level >> (common/cmd_bootelf.c line no:59) >> >> 3. I checked other powerpc architecture like 7xx/74xx, 86xx and 4xx. >> These architecture has seperate cache.S file ( cpu/mpc86xx/ >> cache.S). That >> file contains flush_data_cache function to flush the cache before >> disabling it. But in the MPC85xx flushing the data cache was missing. >> >> 4. This is a bug in the 85xx uboot code. Is there any work arround for >> this? > > 1.1.4 is a fairly old u-boot at this point. I believe we have > reworked the PPC cache ops and fixed the fact that 85xx was missing > flush_data_cache in the process. > Not really, unfortunatelly: the 85xx still lacks flushing the d-cache before disabling it. I was going to fix this by refactoring existing d-cache disabling/flushing routines into a common code that would sit in the lib_ppc/ppccache.S (as mostly exisiting implementations are just copy/paste of the same thing) and have 85xx use it too, but didn't have time yet to clean it up. If anyone is willing to do it sooner, I won't complain :) Rafal