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From: Anup Patel <anup@brainfault.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jslaby@suse.com>, Palmer Dabbelt <palmer@sifive.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Cc: Rob Herring <robh@kernel.org>, Anup Patel <anup@brainfault.org>,
	linux-kernel@vger.kernel.org,
	Christoph Hellwig <hch@infradead.org>,
	Atish Patra <atish.patra@wdc.com>,
	linux-serial@vger.kernel.org, linux-riscv@lists.infradead.org
Subject: [PATCH 0/3] RISC-V SBI earlycon
Date: Tue,  4 Dec 2018 19:25:04 +0530
Message-ID: <20181204135507.3706-1-anup@brainfault.org> (raw)

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


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Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-04 13:55 Anup Patel [this message]
2018-12-04 13:55 ` [PATCH 1/3] tty/serial: Add RISC-V SBI earlycon support Anup Patel
2018-12-05  9:58   ` Greg Kroah-Hartman
2018-12-07 18:45     ` Palmer Dabbelt
2018-12-07 18:30   ` Palmer Dabbelt
2019-01-10 14:07   ` [PATCH] tty/serial: emit CR before NL in RISC-V SBL console Andreas Schwab
2019-01-10 15:16     ` Anup Patel
2019-01-10 15:26       ` Andreas Schwab
2019-01-10 16:17         ` Anup Patel
2019-01-10 17:11           ` [PATCH] tty/serial: use uart_console_write in the RISC-V SBL early console Andreas Schwab
2019-01-11 11:13             ` Anup Patel
2019-01-23 23:58               ` Palmer Dabbelt
2019-01-15 13:59             ` Christoph Hellwig
2019-01-10 20:54           ` [PATCH] tty/serial: emit CR before NL in RISC-V SBL console Palmer Dabbelt
2018-12-04 13:55 ` [PATCH 2/3] RISC-V: defconfig: Enable RISC-V SBI earlycon support Anup Patel
2018-12-07 18:30   ` Palmer Dabbelt
2018-12-04 13:55 ` [PATCH 3/3] RISC-V: Remove EARLY_PRINTK support Anup Patel
2018-12-07 18:30   ` Palmer Dabbelt
2018-12-07 18:30 ` [PATCH 0/3] RISC-V SBI earlycon Palmer Dabbelt
2019-03-25 16:23 ` Andreas Schwab

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