tty: hvc: Don't enable the RISC-V SBI console by default
The new SBI console has the same problem as the old one: there's only one shared backing hardware and no synchronization, so the two drivers end up stepping on each other. This was the same issue the old SBI-0.1 console drivers had, but that was disabled by default when SBI-0.1 was. So just mark the new driver as nonportable. Reported-by: Emil Renner Berthing <kernel@esmil.dk> Fixes: 88ead68e764c ("tty: Add SBI debug console support to HVC SBI driver") Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> Reviewed-by: Paul Walmsley <paul.walmsley@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org> Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Link: https://lore.kernel.org/r/20240214153429.16484-2-palmer@rivosinc.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -108,13 +108,15 @@ config HVC_DCC_SERIALIZE_SMP
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config HVC_RISCV_SBI
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bool "RISC-V SBI console support"
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depends on RISCV_SBI
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depends on RISCV_SBI && NONPORTABLE
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select HVC_DRIVER
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help
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This enables support for console output via RISC-V SBI calls, which
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is normally used only during boot to output printk.
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is normally used only during boot to output printk. This driver
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conflicts with real console drivers and should not be enabled on
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systems that directly access the console.
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If you don't know what do to here, say Y.
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If you don't know what do to here, say N.
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config HVCS
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tristate "IBM Hypervisor Virtual Console Server support"
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