Public bug reported:
When booting on SiFive boards, there are two gettys launched on the same
console.
There is sifive serial console which is the active/only physical
console.
But also, there is serial console exposed over legacy opensbi extension;
which in linux kernel is implemented as hvc0 console, which systemd
starts getty for.
The issue is that the both consoles are actually the same one.
Thus some other distros chose to hard-code disable hvc0 console on
riscv64.
But given that the legacy sbi serial console extension will eventually
go away, it makes sense to disable that in the kernel out right.
By setting:
+# CONFIG_RISCV_SBI_V01 is not set
+# CONFIG_SERIAL_EARLYCON_RISCV_SBI is not set
+# CONFIG_HVC_RISCV_SBI is not set
This way sifive0 console will be discovered and used automatically;
ditto earlyprintk without needing to specify sbi or explicitely set
sifive0 console.
This will also improve UX experience with just a single getty on the
serial connection.
** Affects: linux-riscv (Ubuntu)
Importance: Critical
Status: Confirmed
** Changed in: linux-riscv (Ubuntu)
Milestone: None => ubuntu-21.04
** Changed in: linux-riscv (Ubuntu)
Importance: Undecided => Critical
** Changed in: linux-riscv (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1923084
Title:
duplicate consoles on riscv64
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