| Message ID | 20211222181607.1203191-7-andre.przywara@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Various (build system) fixes | expand |
On Wed, Dec 22, 2021 at 06:16:04PM +0000, Andre Przywara wrote: > The arm64 Linux kernel dropped support for the "earlyprintk" command line > parameter a long time ago[1], instead it uses the earlycon parameter > now. > > Replace earlyprintk with earlycon on the default command line, to see > early kernel output. > > Ideally we would just say "earlycon" (without specifying an MMIO > address), but this relies on the stdout-path property in the /chosen > node, which the model DTs do not carry. Can we send a Linux patch to add that? Mark. > [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8ef0ed95ee04 > > Signed-off-by: Andre Przywara <andre.przywara@arm.com> > --- > configure.ac | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/configure.ac b/configure.ac > index 2b295de..9e3b722 100644 > --- a/configure.ac > +++ b/configure.ac > @@ -99,7 +99,7 @@ AC_SUBST([FILESYSTEM], [$USE_INITRD]) > AM_CONDITIONAL([INITRD], [test "x$USE_INITRD" != "x"]) > > AS_IF([test "x$X_IMAGE" = "x"],[C_CONSOLE="ttyAMA0"],[C_CONSOLE="hvc0"]) > -C_CMDLINE="console=$C_CONSOLE earlyprintk=pl011,0x1c090000" > +C_CMDLINE="console=$C_CONSOLE earlycon=pl011,0x1c090000" > AC_ARG_WITH([cmdline], > AS_HELP_STRING([--with-cmdline], [set a command line for the kernel]), > [C_CMDLINE=$withval]) > -- > 2.25.1 >
On Fri, Jan 07, 2022 at 02:01:37PM +0000, Mark Rutland wrote: > On Wed, Dec 22, 2021 at 06:16:04PM +0000, Andre Przywara wrote: > > The arm64 Linux kernel dropped support for the "earlyprintk" command line > > parameter a long time ago[1], instead it uses the earlycon parameter > > now. > > > > Replace earlyprintk with earlycon on the default command line, to see > > early kernel output. > > > > Ideally we would just say "earlycon" (without specifying an MMIO > > address), but this relies on the stdout-path property in the /chosen > > node, which the model DTs do not carry. > > Can we send a Linux patch to add that? > > Mark. For clarity, I'm going to apply this patch regardless; the above just seems like a nice-to-have. Mark. > > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8ef0ed95ee04 > > > > Signed-off-by: Andre Przywara <andre.przywara@arm.com> > > --- > > configure.ac | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/configure.ac b/configure.ac > > index 2b295de..9e3b722 100644 > > --- a/configure.ac > > +++ b/configure.ac > > @@ -99,7 +99,7 @@ AC_SUBST([FILESYSTEM], [$USE_INITRD]) > > AM_CONDITIONAL([INITRD], [test "x$USE_INITRD" != "x"]) > > > > AS_IF([test "x$X_IMAGE" = "x"],[C_CONSOLE="ttyAMA0"],[C_CONSOLE="hvc0"]) > > -C_CMDLINE="console=$C_CONSOLE earlyprintk=pl011,0x1c090000" > > +C_CMDLINE="console=$C_CONSOLE earlycon=pl011,0x1c090000" > > AC_ARG_WITH([cmdline], > > AS_HELP_STRING([--with-cmdline], [set a command line for the kernel]), > > [C_CMDLINE=$withval]) > > -- > > 2.25.1 > > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
On Fri, 7 Jan 2022 14:01:37 +0000 Mark Rutland <mark.rutland@arm.com> wrote: Hi Mark, > On Wed, Dec 22, 2021 at 06:16:04PM +0000, Andre Przywara wrote: > > The arm64 Linux kernel dropped support for the "earlyprintk" command line > > parameter a long time ago[1], instead it uses the earlycon parameter > > now. > > > > Replace earlyprintk with earlycon on the default command line, to see > > early kernel output. > > > > Ideally we would just say "earlycon" (without specifying an MMIO > > address), but this relies on the stdout-path property in the /chosen > > node, which the model DTs do not carry. > > Can we send a Linux patch to add that? There is already: http://lists.infradead.org/pipermail/linux-arm-kernel/2021-September/685791.html But I think it got stuck somewhere. Cheers, Andre > > [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8ef0ed95ee04 > > > > Signed-off-by: Andre Przywara <andre.przywara@arm.com> > > --- > > configure.ac | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/configure.ac b/configure.ac > > index 2b295de..9e3b722 100644 > > --- a/configure.ac > > +++ b/configure.ac > > @@ -99,7 +99,7 @@ AC_SUBST([FILESYSTEM], [$USE_INITRD]) > > AM_CONDITIONAL([INITRD], [test "x$USE_INITRD" != "x"]) > > > > AS_IF([test "x$X_IMAGE" = "x"],[C_CONSOLE="ttyAMA0"],[C_CONSOLE="hvc0"]) > > -C_CMDLINE="console=$C_CONSOLE earlyprintk=pl011,0x1c090000" > > +C_CMDLINE="console=$C_CONSOLE earlycon=pl011,0x1c090000" > > AC_ARG_WITH([cmdline], > > AS_HELP_STRING([--with-cmdline], [set a command line for the kernel]), > > [C_CMDLINE=$withval]) > > -- > > 2.25.1 > >
diff --git a/configure.ac b/configure.ac index 2b295de..9e3b722 100644 --- a/configure.ac +++ b/configure.ac @@ -99,7 +99,7 @@ AC_SUBST([FILESYSTEM], [$USE_INITRD]) AM_CONDITIONAL([INITRD], [test "x$USE_INITRD" != "x"]) AS_IF([test "x$X_IMAGE" = "x"],[C_CONSOLE="ttyAMA0"],[C_CONSOLE="hvc0"]) -C_CMDLINE="console=$C_CONSOLE earlyprintk=pl011,0x1c090000" +C_CMDLINE="console=$C_CONSOLE earlycon=pl011,0x1c090000" AC_ARG_WITH([cmdline], AS_HELP_STRING([--with-cmdline], [set a command line for the kernel]), [C_CMDLINE=$withval])
The arm64 Linux kernel dropped support for the "earlyprintk" command line parameter a long time ago[1], instead it uses the earlycon parameter now. Replace earlyprintk with earlycon on the default command line, to see early kernel output. Ideally we would just say "earlycon" (without specifying an MMIO address), but this relies on the stdout-path property in the /chosen node, which the model DTs do not carry. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8ef0ed95ee04 Signed-off-by: Andre Przywara <andre.przywara@arm.com> --- configure.ac | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)