On Sun, Jul 05, 2020 at 07:09:14AM +0530, Alim Akhtar wrote: > Hi Krzysztof, > > Also, why did you use different serial for console? > > > Once UART driver gets probed then console changes to ttySAC0. In case I am > using stdout-path only, > after bootconsole is disabled, kernel logs re-start printing from beginning > (which might be expected behaviour?) > > [ 0.012416] printk: console [tty0] enabled > [ 0.016491] printk: bootconsole [exynos4210] disabled > [ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd032] > [ 0.000000] Linux version > 5.8.0-rc3-next-20200703-00008-g4af626444f4a-dirty (alim@alim) > (aarch64-linux-gnu-gcc (Linaro GCC 7.4-2019.02) 7.4.1 20181213 [l0 > [ 0.000000] Machine model: Samsung Exynos7 Espresso board based on Exynos7 >
No, this is not desired. The fix for it should not be redefining the console to wrong argument. For example on Odroid MC1 this problem does not exist: [ 0.000000] earlycon: exynos4210 at MMIO 0x12c20000 (options '115200n8') [ 0.000000] printk: bootconsole [exynos4210] enabled [ 3.111883] printk: console [ttySAC2] enabled [ 3.111883] printk: console [ttySAC2] enabled [ 3.120102] printk: bootconsole [exynos4210] disabled [ 3.120102] printk: bootconsole [exynos4210] disabled but your console for some reason is tty0... why? Is your console ttySAC2? Maybe it is the effect of alias: serial0 = &serial_2; > > However the question is, are you sure you want earlycon on every, including > > successful boot? On most of the boards we do not enable by default. If > > developer needs, he can choose it for example via U-Boot "setenv opts > > earlycon". > > > Using U-Boot is not the case always, any bootload can be used to boot the > Linux, currently I am Coreboot. > And 'earlycon' is not setup by default. > As Espresson board is development board, IMO it is ok to keep it enable all > the time, this helps in quickly knowing what going on incase boot fails early. > Let me know if it is ok to keep " console=ttySAC0,115200n8" or shell I just > re-spin with only 'earlycon'? or any other suggestion? It should be just earlycon. Best regards, Krzysztof
