> Date: Tue, 26 Feb 2008 23:00:17 +0530 > From: "s.balamurugan" <[EMAIL PROTECTED]> > Subject: [U-Boot-Users] Regarding Dcache Flush in MPC85xx > To: [email protected] > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Hi, > 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? > > Thanks and Regards > S.Balamurugan >
Hi S.Balamurugan, I've worked around U-Boot's data cache issue when booting to QNX in a couple of ways: 1. Configure the cache commands into U-Boot and run the "dcache off" command before jumping to QNX, or 2. Add code to the QNX startup module that turns off & unlocks the data cache. Contact me directly if you want help with #2. Regards, Doug ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ U-Boot-Users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/u-boot-users
