Hi,Scott My board is MPC8360EMDS, my bootm command is "bootm uImage ramdisk_ppc mpc836x_mds.dtb", I used the MPC8360E_PB_K26_20071012-LTIB.iso to generate above uImage, ramdisk_ppc,mpc836x_mds.dtb. If I fill the frequency to zero on mpc836x_mds.dts, then the linux-2.6.22 is crashed, the output of serial is nothing. if I fill the right frequency value same as the HRCW on mpc836x_mds.dts, the linux is normal. So I think if the frequency is zero on mpc836x_mds.dts, the u-boot did not pass the right frequency value to dtb.
I think maybe that we need to define some on u-boot, then the u-boot can pass the parameter to linux dtb? I also has another question, I modified the HRCW to config the cpu as 660/330/400 MHZ during power on, I used the "clocks" command on u-boot to see that the clock is real 660/330/400 MHZ, then I changed the frequency value on dts to 660/330/400, after the bootm command, the linux was not carshed after serial configuration, but the output is random. " Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing disabled serial8250.0: ttyS0 at MMIO 0xe0004500 (irq = 16) is a 16550A [output from serial is random] " I have config the frequency both on HRCW and devie tree is the same, why the frequency for serial on linux is not right? Why the 528/260/400 is Ok, the 660/330/400 has problem on serial. Thank you very much. >From: Scott Wood <[EMAIL PROTECTED]> >Reply-To: >To: <[EMAIL PROTECTED]> >Subject: Re: Hi,friends, the question about the u-boot and device tree? >Date:Tue, 18 Mar 2008 13:28:41 -0500 > >On Thu, Mar 13, 2008 at 11:31:11PM +0800, wrote: >> I make all the frequency(timebase-frequency;bus-frequency;clock-frequency) value >> on device tree file equal to zero, I think those frequency will filled by u-boot >> during bootm, but in fact, the u-boot did not fill any frequency. after >> bootm, >> crashed. Why? > >What board? Are you using a device-tree-aware u-boot and the three-argument >form of bootm? What sort of crash? How do you know it's not filling in the >frequencies? > >> Why so many document point out that the zero value will be filled by u-boot? > >Because it does. :-) >If it's not doing so on your board, that needs to be fixed. > >-Scott > ------------------------------------------------------------------------- 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 U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
