On Tue, Feb 14, 2012 at 04:10:08PM +0100, Igor Trevisan wrote: > Hi, > > I'm working on a custom board based on iMX27L. Initially I worked with Redboot > as Linux bootloader but now, I'm happily working with Barebox (2012.01.0) > having replaced Redboot with it. > > Everithing is fine (thanks to the guys in the list for helping me!) but... > I noticed that my Linux apps run more slowly within my system if it's > started by Barebox > then if it's started by Redbbot. > I think it's a matter of internal clocks settings. > > I see that Redboot, for example, set: > CSR=0x33F38107 > while Barebox does: > writel(0x33F30307 | CSCR_MPLL_RESTART | CSCR_SPLL_RESTART, CSCR) > That brings to CSR=0x33F30307 at the end of the PLLs restart procedure. > > Reading the Manual I can see that the differences between the two settings > mean having an arm_clk that is 2/3 and an AHB_clk that's the half. > > Is there a particular reason for having these "slower configuration"? One thing that might be interesting in such cases is the output of the dump_clocks command. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
