From 89175cf766869307c4f57a7a5f63d2819e76c41b Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Wed, 11 Jan 2017 09:14:52 +0100 Subject: s390: provide sclp based boot console Use the early sclp code to provide a boot console. This boot console is available if the kernel parameter "earlyprintk" has been specified, just like it works for other architectures that also provide an early boot console. This makes debugging of early problems much easier, since now we finally have working console output even before memory detection is running. The boot console will be automatically disabled as soon as another console will be registered. Reviewed-by: Peter Oberparleiter Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- Documentation/admin-guide/kernel-parameters.txt | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'Documentation/admin-guide') diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index be7c0d9506b1..ef77c55e87e2 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -979,9 +979,10 @@ address. The serial port must already be setup and configured. Options are not yet supported. - earlyprintk= [X86,SH,BLACKFIN,ARM,M68k] + earlyprintk= [X86,SH,BLACKFIN,ARM,M68k,S390] earlyprintk=vga earlyprintk=efi + earlyprintk=sclp earlyprintk=xen earlyprintk=serial[,ttySn[,baudrate]] earlyprintk=serial[,0x...[,baudrate]] @@ -1016,6 +1017,8 @@ The xen output can only be used by Xen PV guests. + The sclp output can only be used on s390. + edac_report= [HW,EDAC] Control how to report EDAC event Format: {"on" | "off" | "force"} on: enable EDAC to report H/W event. May be overridden -- cgit v1.2.3