On Wed, 07 Jun 2017 00:58:04 PDT (-0700), Arnd Bergmann wrote: > On Wed, Jun 7, 2017 at 9:15 AM, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: >> CC (hypervisor) console folks >> >> On Wed, Jun 7, 2017 at 1:00 AM, Palmer Dabbelt <palmer@xxxxxxxxxxx> wrote: >>> This patch adds a new driver for the console availiable via the RISC-V >>> SBI. This console is specified to be used for early boot messages, and >>> is designed to be a very simple (albiet somewhat slow) console that is >>> always availiable. All RISC-V systems have an SBI console. >>> >>> The SBI console is made availiable for early printk messages and is also >>> availiable as a regular console. >>> >>> Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxx> >>> --- >>> drivers/tty/hvc/Kconfig | 11 +++++ >>> drivers/tty/hvc/Makefile | 1 + >>> drivers/tty/hvc/hvc_sbi.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++ >>> 3 files changed, 114 insertions(+) >>> create mode 100644 drivers/tty/hvc/hvc_sbi.c >>> >>> diff --git a/drivers/tty/hvc/Kconfig b/drivers/tty/hvc/Kconfig >>> index 574da15fe618..f3774adab240 100644 >>> --- a/drivers/tty/hvc/Kconfig >>> +++ b/drivers/tty/hvc/Kconfig >>> @@ -114,4 +114,15 @@ config HVCS >>> which will also be compiled when this driver is built as a >>> module. >>> >>> +config HVC_SBI >>> + bool "SBI console support" >>> + depends on RISCV >>> + select HVC_DRIVER >>> + default y >>> + help >>> + This enables support for console output via RISC-V SBI calls, which >>> + is normally used only during boot to output printk. >>> + >>> + If you don't know what do to here, say Y. >>> + >>> endif # TTY > > Please move this a little higher along with the other HVC_DRIVER > implementations. OK: https://github.com/riscv/riscv-linux/commit/1c769cad7931b7b08644d2d4a7b6985777a8e0be >>> + * RISC-V SBI interface to hvc_console.c >>> + * based on drivers-tty/hvc/hvc_udbg.c >>> + * >>> + * Copyright (C) 2008 David Gibson, IBM Corporation >>> + * Copyright (C) 2012 Regents of the University of California > > 2017? https://github.com/riscv/riscv-linux/commit/dafa678d26886076a8a9cccc2486f1bbbfa44aa8
