144 lines
4.8 KiB
C
144 lines
4.8 KiB
C
/****************************************************************************
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* boards/arm/stm32/nucleo-f429zi/src/stm32_romfs_initialize.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* This file provides contents of an optional ROMFS volume, mounted at boot */
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/mount.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <debug.h>
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#include <errno.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/drivers/ramdisk.h>
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#include "stm32_romfs.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef CONFIG_STM32_ROMFS
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# error "CONFIG_STM32_ROMFS must be defined"
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#else
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#ifndef CONFIG_STM32_ROMFS_IMAGEFILE
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# error "CONFIG_STM32_ROMFS_IMAGEFILE must be defined"
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#endif
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#ifndef CONFIG_STM32_ROMFS_DEV_MINOR
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# error "CONFIG_STM32_ROMFS_DEV_MINOR must be defined"
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#endif
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#ifndef CONFIG_STM32_ROMFS_MOUNTPOINT
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# error "CONFIG_STM32_ROMFS_MOUNTPOINT must be defined"
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#endif
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#define NSECTORS(size) (((size) + ROMFS_SECTOR_SIZE - 1)/ROMFS_SECTOR_SIZE)
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#define STR2(m) #m
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#define STR(m) STR2(m)
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#define MKMOUNT_DEVNAME(m) "/dev/ram" STR(m)
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#define MOUNT_DEVNAME MKMOUNT_DEVNAME(CONFIG_STM32_ROMFS_DEV_MINOR)
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/****************************************************************************
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* Private Data
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****************************************************************************/
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__asm__ (
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" .section .rodata \n"
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" .balign 16 \n"
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" .globl romfs_data_begin \n"
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"romfs_data_begin: \n"
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" .incbin " STR(CONFIG_STM32_ROMFS_IMAGEFILE)"\n"
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" .balign " STR(ROMFS_SECTOR_SIZE) "\n"
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" .globl romfs_data_end \n"
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"romfs_data_end: \n"
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" .globl romfs_data_size \n"
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"romfs_data_size: \n"
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" .word romfs_data_end - romfs_data_begin \n"
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);
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extern const char romfs_data_begin;
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extern const char romfs_data_end;
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extern const int romfs_data_size;
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: stm32_romfs_initialize
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*
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* Description:
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* Registers the aboveincluded binary file as block device.
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* Then mounts the block device as ROMFS filesystems.
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*
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* Returned Value:
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* Zero (OK) on success, a negated errno value on error.
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*
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* Assumptions/Limitations:
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* Memory addresses [&romfs_data_begin .. &romfs_data_begin) should contain
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* ROMFS volume data, as included in the assembly snippet above (l. 84).
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*
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****************************************************************************/
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int stm32_romfs_initialize(void)
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{
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uintptr_t romfs_data_len;
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int ret;
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/* Create a ROM disk for the /etc filesystem */
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romfs_data_len = (uintptr_t)&romfs_data_end - (uintptr_t)&romfs_data_begin;
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ret = romdisk_register(CONFIG_STM32_ROMFS_DEV_MINOR, &romfs_data_begin,
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NSECTORS(romfs_data_len), ROMFS_SECTOR_SIZE);
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if (ret < 0)
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{
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ferr("ERROR: romdisk_register failed: %d\n", -ret);
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return ret;
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}
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/* Mount the file system */
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finfo("Mounting ROMFS filesystem at target=%s with source=%s\n",
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CONFIG_STM32_ROMFS_MOUNTPOINT, MOUNT_DEVNAME);
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ret = nx_mount(MOUNT_DEVNAME, CONFIG_STM32_ROMFS_MOUNTPOINT,
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"romfs", MS_RDONLY, NULL);
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if (ret < 0)
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{
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ferr("ERROR: nx_mount(%s,%s,romfs) failed: %d\n",
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MOUNT_DEVNAME, CONFIG_STM32_ROMFS_MOUNTPOINT, ret);
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return ret;
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}
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return OK;
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}
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#endif /* CONFIG_STM32_ROMFS */
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