e814977c0f
The SD boot loader was not satisfactory because 1) the SD slot is on an optional board and, hence, cannot be part of a fundamental solution. And 2) it is too big. The only storage on borard is the Winbond W25 SPI-bsed FLASH. This commit adds support for a bootload to 1) read code in HEX format from a serial port and write it to the W25 FLASH, or 2) read code in binary form from the W25 FLASH into SRAM and execute the loaded program. boards/z80/ez80/z20x/configs: Added w25boot configuration boards/z80/ez80/z20x/src: Add bootloader logic, w25_main.c. Add logic to manage shared SRAM memory map so that the loaded program does not clobber the bootloader memory. Add logic to recover the bootloader memory into the heap after the loaded program as started. boards/z80/ez80/z20x/scripts: Rework scripts and configuration to support a bootloader and program build. The boolloader cannot use all of SRAM; the program must not clobber the SRAM region used by the bootloader.
91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
/****************************************************************************
|
|
* boards/z80/ez80/z20x/src/ez80_bringup.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 <sys/types.h>
|
|
#include <sys/mount.h>
|
|
#include <debug.h>
|
|
|
|
#include "z20x.h"
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: ez80_bringup
|
|
*
|
|
* Description:
|
|
* Perform architecture-specific initialization
|
|
*
|
|
* CONFIG_BOARD_LATE_INITIALIZE=y :
|
|
* Called from board_late_initialize().
|
|
*
|
|
* CONFIG_BOARD_LATE_INITIALIZE=n && CONFIG_LIB_BOARDCTL=y :
|
|
* Called from the NSH library
|
|
*
|
|
****************************************************************************/
|
|
|
|
int ez80_bringup(void)
|
|
{
|
|
int ret = OK;
|
|
|
|
#ifdef CONFIG_FS_PROCFS
|
|
/* Mount the procfs file system */
|
|
|
|
ret = mount(NULL, "/proc", "procfs", 0, NULL);
|
|
if (ret < 0)
|
|
{
|
|
ferr("ERROR: Failed to mount procfs at /proc: %d\n", ret);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_SPIFLASH
|
|
/* Initialize and register the W25 FLASH file system. */
|
|
|
|
ret = ez80_w25_initialize(CONFIG_Z20X_W25_MINOR);
|
|
if (ret < 0)
|
|
{
|
|
ferr("ERROR: Failed to initialize W25 minor %d: %d\n", 0, ret);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
#ifdef HAVE_MMCSD
|
|
/* Initialize SPI-based SD card slot */
|
|
|
|
ret = ez80_mmcsd_initialize();
|
|
if (ret < 0)
|
|
{
|
|
mcerr("ERROR: Failed to initialize SD card: %d\n", ret);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
UNUSED(ret);
|
|
return OK;
|
|
}
|