Messages in this thread | | | Subject | Re: ARC no console output (was Re: [PATCH 1/2] init/console: Use ttynull as a fallback when there is no console) | From | Vineet Gupta <> | Date | Thu, 7 Jan 2021 21:18:20 -0800 |
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On 1/7/21 7:48 PM, Sergey Senozhatsky wrote: > On (21/01/07 09:58), Vineet Gupta wrote: >> On 1/7/21 9:04 AM, Petr Mladek wrote: >>> On Thu 2021-01-07 08:43:16, Vineet Gupta wrote: >>>> Hi John, >>>> >>>> On 1/7/21 1:02 AM, John Ogness wrote: >>>>> Hi Vineet, >>>>> >>>>> On 2021-01-06, Vineet Gupta <vgupta@synopsys.com> wrote: >>>>>> This breaks ARC booting (no output on console). >>>>> >>>>> Could you provide the kernel boot arguments that you use? This series is >>>>> partly about addressing users that have used boot arguments that are >>>>> technically incorrect (even if had worked). Seeing the boot arguments of >>>>> users that are not experiencing problems may help to reveal some of the >>>>> unusual console usages until now. >>>> >>>> >>>> Kernel command line: earlycon=uart8250,mmio32,0xf0005000,115200n8 >>>> console=ttyS0,115200n8 debug print-fatal-signals=1 >>> >>> This is strange, the problematic patch should use ttynull >>> only as a fallback. It should not be used when a particular console >>> is defined on the command line. >> >> What happens in my case is console_on_rootfs() doesn't find /dev/console and >> switching to ttynull. /dev is not present because devtmpfs doesn't automount >> for initramfs. > > I wonder if we'll move the nulltty fallback logic into printk code [1] > will it fix the problem? > > [1] https://lore.kernel.org/lkml/X6x%2FAxD1qanC6evJ@jagdpanzerIV.localdomain/
Your reasoning in the post above makes total sense.
I tired the patch: adding register_ttynull_console() call in console_device(), removing from console_on_rootfs() band that works too.
| Warning: unable to open an initial console. Fallback to ttynull. | Warning: Failed to add ttynull console. No stdin, stdout, and stderr for the init process! | Freeing unused kernel memory: 3096K | This architecture does not have kernel memory protection. | Run /init as init process | with arguments: | /init | with environment: | HOME=/ | TERM=linux | Starting System logger (syslogd) | Bringing up loopback device | Starting inetd | Mounting Posix Mqueue filesys | CONFIG_INITRAMFS_SOURCE="~/arc/RAMFS/archs/ramfs_2011-GNU-2020-03-glibc-2.32-tiny" | ********************************************************************** | Welcome to ARCLinux | ********************************************************************** | [ARCLinux]#
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