From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jerry Van Baren Date: Wed, 22 Jun 2005 08:10:25 -0400 Subject: [U-Boot-Users] mtest issue on MPC8272 In-Reply-To: <20050622034649.25352.qmail@web31505.mail.mud.yahoo.com> References: <20050622034649.25352.qmail@web31505.mail.mud.yahoo.com> Message-ID: <42B95531.9040202@smiths-aerospace.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de raymond yang wrote: > Hi All, > > My board got problems while running m_test, any idea, > > Looks like the high order two bytes mismatched, while > low part correct. > > Does this mean we failed to configure the SDRAM or due > to hardwarer issue? > > thanks! > > Best Regards > Raymond > > > => mtest > Pattern 00000000 Writing... Reading... > Mem error @ 0x00110000: found 00044000, expected > 00004000 > > Mem error @ 0x00118000: found 40246000, expected > 00006000 > > Mem error @ 0x001A0000: found 00268000, expected > 00028000 > > Mem error @ 0x001B0000: found 0006C000, expected > 0002C000 > > Mem error @ 0x001F8000: found 0427E000, expected > 0003E000 > > Mem error @ 0x00200000: found CC320000, expected > 00040000 > > Mem error @ 0x00208000: found C4322000, expected > 00042000 Hi Raymond, Suspicious: only one error per instance, and that on a 4KB boundary. Sounds like Something Bad[tm] is happening on a page boundary (e.g. page close, new page open). For the common hardware faults of shorted address and/or data lines, you would get a whole burst of errors when the affected lines are exercised. Questions: * What is your memory configuration (x8, x16, x32)? What is the SDRAM page size? * Are these the only errors found? * Can you use the command line to write to the error addresses and read back the proper values? If not, what do you get? Use various patterns, are the upper two bytes random or related to the lower two bytes? Inquiring minds want to know... gvb