On Thu, Apr 22, 2010 at 12:58 PM, Sylvain Lamontagne <sylvain.lamonta...@novariant.com> wrote: > Hi everybody, > > I'm trying to remove the console from a custom board based on a > MPC5200B. During development we used console=ttyS1,115200 in our bootcmd > for the kernel, but now that the product is ready to be shipped we want > to use ttyS1 for something else and would like to deactivate completely > the console. So the unit would be accessible only by ssh if needed. > > (I'm not really confortable with this since a network problem would > prevent us of even debugging the platform... but I've been ask to do > it.) > > Anyway, whenever I try to change console= to null or to tty1 or anything > else, the boot is hanging somewhere ( I know that, because some leds are > not flashing like they should on a normal boot and I can't login in with > ssh). > > I've tried to use tty1, none, null, zero and I've tried to completely > remove the console= arguments... but nothing work, its hanging there > without any flashing leds. > > I've tried redirecting another "real" serial port and it worked, so > console=ttyPSC2,115200 work... but we need it also... so it can't do. > > I've also tried the U-Boot's silent variable trick ... but it did not > work and I had to erase the environment of U-Boot with a JTAG to recover > back my default setting of ttyS1. > > I'm now at a point where I think I have try everything that I know, and > since I have no way of "seeing" what is going on ... it's pretty hard to > debug.
Can you halt the processor with JTAG and look at the contents of __log_buf? > The kernel is 2.6.29.2 and can't really be changed... (but it may be > patch) > This board doesn't have a framebuffer or a graphic chipset, everything > was done with a serial connection and now we want to remove this serial > connection (console) before sending it to a customer. > > 1. Is it possible ? Yes, I believe so, but I haven't tried. > 2. Do you have any idea how it can be achieve ? You should be doing the right thing. Are your userspace init scripts trying to start a getty on the non-existent console device? > 3. Do you know a bug in 2.6.29.2 that could prevent this to work ? no > 4. The 'chosen' node is empty in my dts, does it require something to be > set ? no I think your best bet is to figure out some way to get at __log_buf to retrieve the kernel output after the failed boot. Cheers, g. -- Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
