From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Hawkins Date: Wed, 02 May 2007 10:48:20 -0700 Subject: [U-Boot-Users] Latest git not working for MPC8349EMDS In-Reply-To: References: <4637A41D.20107@ovro.caltech.edu> <4637B178.7030004@ovro.caltech.edu> Message-ID: <4638CEE4.2080507@ovro.caltech.edu> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi Michael, >> Confusing eh!? > > Very! Thank you for explaining it. No problem! >> Look at the p14, and follow along with that example, see if you >> can see the right bytes in memory. > > Almost, but not quite. For one, the flash was locked, and that was why > the flash erase/copy would not take before. Secondly, the eleventh byte > is different, which I think just means I have a different rev than > yours, 0x43 vs. 0x7f (and I can verify that it is a read-only register): > > => md.b f8000000 20 > f8000000: 2f 0c 40 08 86 af 07 33 ff ff 43 12 ff ff ff 02 > /. at ....3..C..... > f8000010: 22 07 05 19 24 ff ff ff ff ff ff ff ff ff ff ff > "...$........... I don't have the PDF around just at the moment, but I suspect that you are right. >> Take the time to read the document I sent. Read the MPC8349 manual >> with regards to resetting the processor. Eventually it'll make >> sense. I found it confusing to start with. Hopefully this will >> help you. >> > Big help already, I was able to flash the new u-boot to fe000000, when I > could not before. Unfortunately, I am still booting to the old u-boot > at fff00000(?) I apologize if I am being dense, but I thought your > document indicates flashing fe000000 with a u-boot.bin would be all that > is required to boot from low memory. For the board to low-memory boot, the HRCW has to indicate low-boot. I'm pretty sure all I did was write the new HRCW to the first sector of Flash (or maybe it comes with the U-Boot image, I can't recall). I think there may also be a jumper setting you need to change to tell the hardware to read the HRCW from flash rather than the headers. A little more reading should get you booted. But if you can't figure it out, let me know and I'll take a look later on. Dave