Hi U will have to look what parameters u r passing to kernel. i mean console=ttyS0 , 9600 u have to pass to kernel. U have to enable support for console on serial port while configuring the kernel.Now u have to see that "include/asm/serial.h" ur serial port mapping is correct or not. I mean u have specified correct io address or not.
Printk does not need irq. So u do not have to bother abt irq right now. Befor setup_console all printk messages will be bufferd, means they will not come to console. Only after setup_console is done & uart is mapped properly u will see all the messages on the console. May be u will have success but who knows. thanx Bhupi Linux+Hypertransport ---> Silicon www.gdatech.com --- acurtis at directvinternet.com wrote: > > 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/
