> -----Ursprüngliche Nachricht----- > Von: linux-omap-owner@xxxxxxxxxxxxxxx > [mailto:linux-omap-owner@xxxxxxxxxxxxxxx] Im Auftrag von Jassi Brar > Gesendet: Dienstag, 18. September 2012 13:54 > An: Maximilian Schwerin > Cc: linux-omap@xxxxxxxxxxxxxxx > Betreff: Re: How to disable message "Uncompressing linux..." > on kernel start? > > >> > On 18 September 2012 12:09, Maximilian Schwerin > >> > <Maximilian.Schwerin@xxxxxxxxx> wrote: > >> >> Hi all, > >> >> > >> >> I have been convinced that my patch for disabling the message > >> >> "Uncompressing linux..." on kernel start was not all that > >> good an idea. > >> >> As the problem still remains an issue for me and I'd like > >> to find a fix > >> >> for everyone I'd like to ask for pointers where or how > to fix this. > >> >> > >> >> To sum up my problem: I'm using the primary serial port on > >> an OMAP3 as a > >> >> debug console for development. In production we set the > >> u-boot silent > >> >> option which disables all kernel logging to this serial > >> port. The only > >> >> kernel message that remains is "Uncompressing linux..." > at the very > >> >> beginning. As we connect an external device via this port > >> in production > >> >> environments this is not acceptable. > >> >> > >> > Perhaps adding config choice under "Kernel low-level > >> debugging port", > >> > to select the UART port to direct the early prints to, > would help. > >> > Like some platforms already do. See DEBUG_CLPS711X_UART1/2 , > >> > DEBUG_MSM_UART1/2/3 etc. > >> > >> On a second thought, I think we need a new config independent > >> of DEBUG_LL. > >> Something like what Samsung code does with symbol > >> S3C_LOWLEVEL_UART_PORT in arch/arm/plat-samsung/Kconfig > > > > In my case I need to be able to disable it completely. > > > The idea is to direct the output to some other (unused) UART port. > > Also if one doesn't select DEBUG_LL, I wonder if it makes sense to > expect the "Uncompressing .... " message, which too is just dumping > raw data onto UART. So another option might be to simply use > CONFIG_DEBUG_LL instead of CONFIG_DEBUG_DECOMPRESS_KERNEL ? In http://www.spinics.net/lists/arm-kernel/msg195871.html Russell King pointed out that the message goes to fb on some platforms. So the ideal solution would be to assure, that this message is not printed if the kernel parameter console is not set.
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