| /**************************************************************************** |
| * arch/risc-v/src/litex/litex_start.c |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The |
| * ASF licenses this file to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations |
| * under the License. |
| * |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Included Files |
| ****************************************************************************/ |
| |
| #include <nuttx/config.h> |
| |
| #include <stdint.h> |
| |
| #include <nuttx/fdt.h> |
| #include <nuttx/init.h> |
| #include <arch/board/board.h> |
| |
| #include "litex_clockconfig.h" |
| #include "litex.h" |
| #include "chip.h" |
| |
| #ifdef CONFIG_BUILD_KERNEL |
| # include "litex_mm_init.h" |
| #endif |
| |
| /**************************************************************************** |
| * Pre-processor Definitions |
| ****************************************************************************/ |
| |
| #ifdef CONFIG_DEBUG_FEATURES |
| # define showprogress(c) riscv_lowputc(c) |
| #else |
| # define showprogress(c) |
| #endif |
| |
| #if defined (CONFIG_BUILD_KERNEL) && !defined (CONFIG_ARCH_USE_S_MODE) |
| # error "Target requires kernel in S-mode, enable CONFIG_ARCH_USE_S_MODE" |
| #endif |
| |
| /**************************************************************************** |
| * Public Data |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Public Functions |
| ****************************************************************************/ |
| |
| /**************************************************************************** |
| * Name: __litex_start |
| ****************************************************************************/ |
| |
| void __litex_start(int hart_index, const void * fdt, int arg) |
| { |
| (void)hart_index; |
| (void)arg; |
| |
| const uint32_t *src; |
| uint32_t *dest; |
| |
| /* Clear .bss. We'll do this inline (vs. calling memset) just to be |
| * certain that there are no issues with the state of global variables. |
| */ |
| |
| for (dest = (uint32_t *)_sbss; dest < (uint32_t *)_ebss; ) |
| { |
| *dest++ = 0; |
| } |
| |
| /* Move the initialized data section from his temporary holding spot in |
| * FLASH into the correct place in SRAM. The correct place in SRAM is |
| * give by _sdata and _edata. The temporary location is in FLASH at the |
| * end of all of the other read-only data (.text, .rodata) at _eronly. |
| */ |
| |
| /* for vexriscv the full image is loaded in ddr ram */ |
| |
| for (src = (const uint32_t *)_eronly, |
| dest = (uint32_t *)_sdata; dest < (uint32_t *)_edata; |
| ) |
| { |
| *dest++ = *src++; |
| } |
| |
| /* Assume the FDT address was passed in if not NULL */ |
| |
| if (fdt) |
| { |
| fdt_register(fdt); |
| } |
| else |
| { |
| fdt_register((const char *)CONFIG_LITEX_FDT_MEMORY_ADDRESS); |
| } |
| |
| #ifdef CONFIG_RISCV_PERCPU_SCRATCH |
| riscv_percpu_add_hart(0); |
| #endif |
| |
| /* Setup PLL */ |
| |
| litex_clockconfig(); |
| |
| /* Configure the UART so we can get debug output */ |
| |
| litex_lowsetup(); |
| |
| showprogress('A'); |
| |
| #ifdef USE_EARLYSERIALINIT |
| riscv_earlyserialinit(); |
| #endif |
| |
| showprogress('B'); |
| |
| /* Do board initialization */ |
| |
| #ifdef CONFIG_BUILD_KERNEL |
| /* Setup page tables for kernel and enable MMU */ |
| |
| litex_mm_init(); |
| #endif |
| |
| showprogress('C'); |
| |
| /* Call nx_start() */ |
| |
| nx_start(); |
| |
| /* Shouldn't get here */ |
| |
| for (; ; ); |
| } |