These patches support single-core DTS boot to the serial port login
interface, which can be operated using conventional commands.

I have successfully tested it on the Loongson 2K1000 machine.
pmon: http://cgit.loongnix.org/cgit/pmon-loongson3/

Qing Zhang (6):
  MIPS: Loongson64: DeviceTree for 2K1000
  MIPS: Loongson64: Distinguish firmware dependencies DTB/LEFI.
  MIPS: Loongson64: Add support for the 2K1000 to get cpu_clock_freq
  MIPS: Loongson64: Add 2K1000 early_printk_port
  irqchip/loongson-liointc: irqchip add 2.0 version.
  MIPS: Loongson64: Add a Loongson-2k default config file

 arch/mips/boot/dts/loongson/Makefile          |   1 +
 .../boot/dts/loongson/loongson64-2k1000.dtsi  | 243 ++++++++++++
 .../dts/loongson/loongson64_2core_2k1000.dts  |  10 +
 arch/mips/configs/loongson2k_defconfig        | 353 ++++++++++++++++++
 .../include/asm/mach-loongson64/boot_param.h  |   6 +
 .../asm/mach-loongson64/builtin_dtbs.h        |   1 +
 .../include/asm/mach-loongson64/loongson.h    |   3 +-
 arch/mips/loongson64/env.c                    |  13 +-
 arch/mips/loongson64/init.c                   |  21 +-
 arch/mips/loongson64/time.c                   |  14 +
 drivers/irqchip/irq-loongson-liointc.c        |  55 ++-
 11 files changed, 706 insertions(+), 14 deletions(-)
 create mode 100644 arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
 create mode 100644 arch/mips/boot/dts/loongson/loongson64_2core_2k1000.dts
 create mode 100644 arch/mips/configs/loongson2k_defconfig

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2.20.1