What processor are you using? I have seen this on 8260 processors because the startup code trys to reconfigure the clocks and subsequently the baud rate generators. Something like this is the first thing I would check.
> -----Original Message----- > From: owner-linuxppc-embedded at lists.linuxppc.org > [mailto:owner-linuxppc-embedded at lists.linuxppc.org]On Behalf Of Yu > Bo-BOYU1 > Sent: Monday, November 04, 2002 2:05 PM > To: Linuxppc-Embedded (E-mail) > Subject: printk and > > > > Hi, > > The linux object did not go very far on my custom board. As soon as it > decompress > itself then it hang silently. The last printout is "Now booting > the kernel". > > I am trying to understand why printk() did not print out even one > character > as this > function is called at very beginning of start_kernel(). I had the > following > questions. > > 1. What does this statement mean in kernel/printk.c ? > > __setup("console=", console_setup); > > 2. How does the underneath driver of printk() is initialized? If > printk() is > called before > init_IRQ(). I assume it can only push characters out instead of accepting > input just > like putc() or serial_putc() before uncompessing linux. But after intense > search inside > linux source code, I am still puzzled... > > This is the boot log. > Starting at 0x800000... > > loaded at: 00800000 0089E1BC > zimage at: 00805870 0089AC70 > avail ram: 00400000 00800000 > > Linux/PPC load: > Uncompressing Linux...done. > Now booting the kernel > > > Thanks. > > Bo > ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
