Fix fe310 signal handling
* arch: fe310: Disable all interrupts in mie at __start
* arch: fe310: Fix up_irq_enable() to set external interrupt only
* arch: fe310: Fix up_schedule_sigaction() to save REG_INT_CTX
* boards: hifive1-revb: Adjust stack size to reduce runtime memory
Approved-by: Gregory Nutt <gnutt@nuttx.org>
HiFive1 with qemu
* arch: risc-v: Add include/.gitignore
* arch: risc-v: Add src/.gitignore
* arch: risc-v: Remove uncommon function prototypes in include/irq.h
* arch: risc-v: Add missing symbols and function prototypes in src/common/up_internal.h
* arch: risc-v: Add src/common/up_modifyreg32.c
* arch: risc-v: Enable include Make.dep in src/Makefile
* arch: risc-v: Fix stack coloration in common/up_createstack.c
* arch: risc-v: Add common/up_puts.c
* arch: risc-v: Add common/up_checkstack.c
* arch: rv32im: Move all logics from up_dumpstate.c to up_assert.c
This change is same as other architectures like arm/src/armv7-m
* arch: Select ARCH_HAVE_STACKCHECK for RISC-V in Kconfig
* arch: risc-v: Add SiFive fe310 processor
NOTE: Currently only tested with qemu
* boards: hifive1-revb: Add SiFive hifive1-revb board
NOTE: Currently only tested with qemu
* tools: Add fe310 processor to configure.sh
Approved-by: Alan Carvalho de Assis <acassis@gmail.com>
Approved-by: Gregory Nutt <gnutt@nuttx.org>
