Sorry for the confusing. I just figured out my problem is not for the Uboot version...
As you suggested, I debuged the hw action related to serial driver today. I add the "console=ttyS2" in my uboot bootargs and corrected some part, but still no output yet. Is there other factors will affect the console output, except the serial driver? BestRegards, Mike Qin -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Detlev Zundel Sent: Thursday, June 05, 2008 10:22 PM To: linuxppc-embedded@ozlabs.org Subject: Re: No console output when booting linux from uboot Hi Mike, > Thanks. Now I am confusing with the way uboot passing parameters to > linux kernel: > > in Uboot 1.2.0: Kernel is entered through the following calling > theKernel (linux_argc, linux_argv, linux_env, 0); while in > Uboot 1.3.0: > (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end); > > The linux kernel I used is designed with Uboot 1.2.0, while I used > 1.3.2. Will this be a problem for passing the parameters? Hm, now you got me confused. I cannot see the first version anywhere in u-boot or its history. Even in 1.2.0 its either (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end); or (*kernel) ((bd_t *)of_flat_tree, (ulong)kernel, 0, 0, 0); The first path is chosen when using the traditional 2 argument bootm command, the logic being that this is a non-fdt aware kernel. The second path is chosen when using the newer three-argument version of bootm with the third argument being the flat device tree (needs CONFIG_OF_FLAT_TREE in U-Boot 1.2.0). So if you have anything differing from this, you have to conclude for yourself what the situation is. When you have mainline U-Boot and Linux, i.e. comparable what I describe, we especially took care that we are backwards compatible. So by using the two- or three parameter version, we effectively select between two kernel call conventions. The situation stays the same in newer U-Boot versions. Cheers Detlev -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: [EMAIL PROTECTED] _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
