mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 11:00:15 +00:00
ba9aa40bb3
Linux determines its console based on several sources: 1. the console command line parameter 2. device tree (e.g. /chosen/stdout-path) 3. various other board- and arch-specific sources If the console parameter specifies a real console (e.g. ttyS0) then that is used as /dev/console. However, if it does not specify a real console (e.g. ttyDoesntExist) then *nothing* will be used as /dev/console. Reading/writing it will return ENODEV. Additionally, no other source will be used as a console source. Linux commit ab4af56ae250 ("printk/console: Allow to disable console output by using console="" or console=null") recently changed the semantics of the parameter. Previously, specifying console="" would be treated like specifying some other bad console. This commit changed things so that it added /dev/ttynull as a console (if available). However, it also allows for other console sources. If the device tree specifies a console (such as if U-Boot and Linux share a device tree), then it will be used in addition to /dev/ttynull. This can result in a non-silent console. To avoid this, explicitly set ttynull as the console. This will disable other console sources. If CONFIG_NULL_TTY is disabled, then this will have the same behavior as in the past (no output, and writing /dev/console returns ENODEV). [1] and [2] have additional background on this kernel change. [1] https://lore.kernel.org/all/20201006025935.GA597@jagdpanzerIV.localdomain/ [2] https://lore.kernel.org/all/20201111135450.11214-1-pmladek@suse.com/ Signed-off-by: Sean Anderson <sean.anderson@seco.com> |
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.. | ||
android_ab.c | ||
boot_fit.c | ||
bootdev-uclass.c | ||
bootflow.c | ||
bootm.c | ||
bootm_os.c | ||
bootmeth-uclass.c | ||
bootmeth_distro.c | ||
bootmeth_efi.c | ||
bootmeth_efi_mgr.c | ||
bootmeth_pxe.c | ||
bootmeth_sandbox.c | ||
bootmeth_script.c | ||
bootretry.c | ||
bootstd-uclass.c | ||
common_fit.c | ||
fdt_region.c | ||
image-android-dt.c | ||
image-android.c | ||
image-board.c | ||
image-cipher.c | ||
image-fdt.c | ||
image-fit-sig.c | ||
image-fit.c | ||
image-host.c | ||
image-pre-load.c | ||
image-sig.c | ||
image.c | ||
Kconfig | ||
Makefile | ||
pxe_utils.c | ||
system_bootdev.c |