From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Korsgaard Date: Wed, 13 Jan 2021 23:07:45 +0100 Subject: [Buildroot] ARC no console output (was Re: [PATCH 1/2] init/console: Use ttynull as a fallback when there is no console) In-Reply-To: <466644f5-bed7-caef-9fcd-e66208f65545@synopsys.com> (Vineet Gupta's message of "Thu, 7 Jan 2021 09:58:05 -0800") References: <20201111135450.11214-1-pmladek@suse.com> <20201111135450.11214-2-pmladek@suse.com> <8735zdm86m.fsf@jogness.linutronix.de> <50ade852-c598-6476-1f4b-9a3f8d11d143@synopsys.com> <466644f5-bed7-caef-9fcd-e66208f65545@synopsys.com> Message-ID: <87turkfq32.fsf@dell.be.48ers.dk> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net >>>>> "Vineet" == Vineet Gupta writes: > 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 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. But our initramfs/cpio logic ensures that the initramfs has a static /dev/console device node, so how can that be? https://git.buildroot.net/buildroot/tree/fs/cpio/cpio.mk#n25 -- Bye, Peter Korsgaard