Messages in this thread | | | From | "Bradley D. LaRonde" <> | Subject | Re: Linux console at boot | Date | Tue, 12 Feb 2002 10:14:36 -0500 |
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----- Original Message ----- From: "Geert Uytterhoeven" <geert@linux-m68k.org> To: "George Bonser" <george@gator.com> Cc: "Linux Kernel Development" <linux-kernel@vger.kernel.org> Sent: Tuesday, February 12, 2002 3:52 AM Subject: Re: Linux console at boot
> On Thu, 24 Jan 2002, George Bonser wrote: > > Is there any way to stop the console scrolling during boot? My reason > > for this is I am trying to troubleshoot a boot problem with > > 2.4.18-pre7 and I would like to give a more useful report than "it > > won't boot" but the screen outputs information every few seconds and I > > can't "freeze" the display so I can copy down the initial error(s). > > > > This is an Intel unit using the standard console (not serial console). > > pre7 will not boot but pre6 boots every time. > > On Amiga (m68k and PPC) we have a `debug=mem' option that will write all kernel > messages to a 256 KiB block (marked with a magic number) of Chip RAM. If the > system crashes early, you can reboot into AmigaOS and run a special utility > that finds the 256 KiB block (Chip RAM is not completely erased on reboot) and > extracts the messages.
Also, printk already writes (appends) to a smaller-but-sufficiently-large buffer - log_buf. When debugging early boot crashes, I frequently look up the address of log_buf in System.map and dump that area of memory from my boot monitor or JTAG prompt.
Regards, Brad
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