Hi, On Wed, Feb 15, 2012 at 10:15 AM, Kamel BOUHARA <k.bouhara@xxxxxxxxx> wrote: > Hi Igor, > > What revision of imx27 silicon do you have? Silicon Rev. of my iMX27L is V2.1 (code M72J). > If it's a rev2.0 or 2.1, you shoult take a look a the freescale errata in > order to set your PLL properly. I had a look at the Chip Errata. I saw that there's a PLL problem and for it Freescale suggest two possible workarounds, a Hardware and a Software one. On my board the Hardware workaround has been used. By the way, I tried also to add the SW workaround configuring: MPCTL0=0x00262C15 (I use the 26MHz oscillator as source) and CSCR=0x33F30307 (to use DIV3 as it is by default and AHBDIV=11) or CSCR=0x33F30207 (to use DIV3 as it is by default and AHBDIV=10 to slow down AHB) and I discovered that this configuration (both of CSCR) works properly on some boards, while on other boards (same uC-Memories core but different peripherals and power supply) the system starts and hangs continuously as I described in my first post. So, at the end, I think that my settings to speed up the uC core @400MHz are correct but probably I have a power supply problem on one of the products I'm working on! I'll investigate this and inform the list if it's not so... Thanks for the support, also thanks to Juergen for his suggestions. Ciao, I. -- "Don't find fault, find a remedy." (Henry Ford) _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
