linux-kernel - [PATCH 0/3] RISC-V SBI earlycon

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Message-Id: <20181204135507.3706-1-anup@brainfault.org>
Date:   Tue,  4 Dec 2018 19:25:04 +0530
From:   Anup Patel <anup@...infault.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>
Cc:     Atish Patra <atish.patra@....com>,
        Christoph Hellwig <hch@...radead.org>,
        Rob Herring <robh@...nel.org>, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        Anup Patel <anup@...infault.org>
Subject: [PATCH 0/3] RISC-V SBI earlycon

This patchset adds RISC-V SBI earlycon and removes RISC-V EARLY_PRINTK.

We should use earlycon over existing EARLY_PRINTK for SBI console because:
1. It's a more generic way of implementing early console for debugging
2. Current RISC-V EARLY_PRINTK is a compile-time option whereas earlycon
   is enabled at run-time via kernel parameters.
3. To use earlycon with SBI, we have to pass "earlycon=sbi" in kernel
   parameters. If earlycon kernel parameter is not provided then kernel
   boots much faster which is very useful in real-world RISC-V deployments.

The patchset is tested on QEMU virt machine. It is based on Linux-4.20-rc5
and can be found at riscv_earlycon_v1 branch of:
https://github.com/avpatel/linux.git

Anup Patel (3):
  tty/serial: Add RISC-V SBI earlycon support
  RISC-V: defconfig: Enable RISC-V SBI earlycon support
  RISC-V: Remove EARLY_PRINTK support

 arch/riscv/Kconfig.debug                |  2 --
 arch/riscv/configs/defconfig            |  1 +
 arch/riscv/kernel/setup.c               | 28 -------------------------
 drivers/tty/serial/Kconfig              | 12 +++++++++++
 drivers/tty/serial/Makefile             |  1 +
 drivers/tty/serial/earlycon-riscv-sbi.c | 28 +++++++++++++++++++++++++
 6 files changed, 42 insertions(+), 30 deletions(-)
 create mode 100644 drivers/tty/serial/earlycon-riscv-sbi.c

-- 
2.17.1