configs/makerlisp/src/sd_main.c: Add a tiny FLASH-resident loader that will load and start applications in intel HEX format from an SD card.

configs/makerlisp/src/sd_main.c

@@ -0,0 +1,163 @@
+/****************************************************************************
+ * configs/makerlisp/src/sd_main.c
+ *
+ *   Copyright (C) 2019 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/mount.h>
+#include <fcntl.h>
+#include <syslog.h>
+#include <hex2bin.h>
+
+#include <arch/irq.h>
+
+#include "makerlisp.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define MMCSD_BLOCKDEV   "/dev/mmcsd0"
+#define MMCSD_MOUNTPT    "/mnt/sdcard"
+#define MMCSD_HEXFILE    "/mnt/sdcard/nuttx.hex"
+
+#define SRAM_RESET       0x040000
+#define SRAM_ENTRY       ((sram_entry_t)SRAM_RESET)
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+typedef CODE void (*sram_entry_t)(void);
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sd_main
+ *
+ * Description:
+ *   sd_main is a tiny program that runs in FLASH.  sd_main will
+ *   configure SRAM and load an Intel HEX file into SRAM,
+ *   and either start that program or wait for you to break in with the
+ *   debugger.
+ *
+ ****************************************************************************/
+
+int sd_main(int argc, char *argv)
+{
+  int fd;
+  int ret;
+
+  /* SRAM was already initialized at boot time, so we are ready to load the
+   * Intel HEX stream into SRAM.
+   */
+
+#ifdef CONFIG_BOARD_LATE_INITIALIZE
+  /* Perform board-level initialization.  This should include registering
+   * the MMC/SD block driver at /dev/mmcsd0.
+   */
+
+  DEBUG_VERIFY(ez80_bringup());
+#endif
+
+  syslog(LOG_INFO, "Loading %s\n", MMCSD_HEXFILE);
+
+  /* Mount the MMC/SD block drivers at /mnt/sdcard */
+
+  ret = mount(MMCSD_BLOCKDEV, MMCSD_MOUNTPT, "vfat", 0, NULL);
+  if (ret < 0)
+    {
+      int errcode = errno;
+      syslog(LOG_ERR, "ERROR: Failed to mount filesystem at %s: %d\n",
+             MMCSD_MOUNTPT, errcode);
+      goto halt;
+    }
+
+  /* Open the file /mnt/sdcard/nuttx.hex */
+
+  fd = open(MMCSD_HEXFILE, O_RDONLY);
+  if (fd < 0)
+    {
+      int errcode = errno;
+      syslog(LOG_ERR, "ERROR: Failed to mount filesystem at %s: %d\n",
+             MMCSD_MOUNTPT, errcode);
+      goto halt_with_mount;
+    }
+
+  /* Load the HEX image into memory */
+
+  ret = hex2mem(fd,
+                (uint32_t)SAM_DDRCS_VSECTION,
+                (uint32_t)(SAM_DDRCS_VSECTION + CONFIG_SAMA5_DDRCS_SIZE),
+                0);
+  if (ret < 0)
+    {
+      /* We failed the load */
+
+      printf("ERROR: Intel HEX file load failed: %d\n", ret);
+      goto halt_with_hexfile;
+    }
+
+  close(fd);
+  umount(MMCSD_MOUNTPT);
+
+  /* The reset vector should now be present at the beginning of SRAM.
+   * This assumes that the image was loaded at 0x040000 and that the reset
+   * vector is the first thing in memory.
+   */
+
+  syslog(LOG_INFO, "Starting at %p\n", SRAM_ENTRY);
+
+  /* Interrupts must be disabled through the following. */
+
+  (void)up_irq_save();
+
+  /* Then jump into SRAM via the reset vector at 0x040000 */
+
+  SRAM_ENTRY();
+
+halt_with_hexfile:
+  close(fd);
+halt_with_mount:
+  umount(MMCSD_MOUNTPT);
+halt:
+  for (; ; );
+  return 0; /* Will not get here */
+}