--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/target-utils/loadagent/amdflash.c	Tue Mar 03 06:06:17 2020 +0000
@@ -0,0 +1,90 @@
+/*
+ * This module implements the AMFB and AMFW commands for programming
+ * AMD-style flash memories.  Syntax:
+ *
+ * AMFB <baseaddr>	-- sets the base address for subsequent AMFW commands
+ * AMFW <offset> <hexstring>	-- the actual flash write operation
+ *
+ * The flash memory is assumed to be 16 bits wide.  The hex string
+ * argument to the AMFW command is just data, with no header, address,
+ * length, checksum or other additions.  The number of hex digits in the
+ * string must be a multiple of 4, and the byte order is the same as
+ * that of TI's *.m0 files: we interpret the string as consisting of
+ * 16-bit words rather than bytes.
+ *
+ * The address to which each flash write is directed is the sum of the
+ * base given to AMFB and the offset given to AMFW.  The fixed offsets
+ * of 0xAAA and 0x554 (0x555 and 0x2AA in words) prescribed for the flash
+ * programming command sequence are also made from the base set with AMFB.
+ */
+
+#include <sys/types.h>
+#include "types.h"
+
+static u32 base_addr;
+
+void
+cmd_AMFB(argbulk)
+	char *argbulk;
+{
+	char *argv[2];
+	u_long addr;
+
+	if (parse_args(argbulk, 1, 1, argv, 0) < 0)
+		return;
+	if (parse_hexarg(argv[0], 8, &addr) < 0) {
+		printf("ERROR: argument must be a valid 32-bit hex address\n");
+		return;
+	}
+	if (addr & 1) {
+		printf("ERROR: odd address\n");
+		return;
+	}
+	base_addr = addr;
+}
+
+void
+cmd_AMFW(argbulk)
+	char *argbulk;
+{
+	char *argv[3], *s;
+	u_long offset;
+	volatile u16 *flashptr;
+	u32 datum;	/* needs to be u32 for decode_hex_digits() */
+	int i;
+
+	if (parse_args(argbulk, 2, 2, argv, 0) < 0)
+		return;
+	if (parse_hexarg(argv[0], 8, &offset) < 0) {
+	    printf("ERROR: offset argument must a valid 32-bit hex value\n");
+		return;
+	}
+	if (offset & 1) {
+		printf("ERROR: odd offset argument\n");
+		return;
+	}
+	flashptr = (volatile u16 *)(base_addr + offset);
+	for (s = argv[1]; *s; flashptr++, s += 4) {
+		if (decode_hex_digits(s, 4, &datum) < 0) {
+			printf("ERROR: bad AMFW hex string argument\n");
+			return;
+		}
+		if (*flashptr != 0xFFFF) {
+			printf("ERROR: flash not blank at %08X\n",
+				(u_long) flashptr);
+			return;
+		}
+		*(volatile u16 *)(base_addr + 0xAAA) = 0xAA;
+		*(volatile u16 *)(base_addr + 0x554) = 0x55;
+		*(volatile u16 *)(base_addr + 0xAAA) = 0xA0;
+		*flashptr = datum;
+		for (i = 10000; i; i--)
+			if (*flashptr == datum)
+				break;
+		if (!i) {
+			printf("ERROR: flash write timeout at %08X\n",
+				(u_long) flashptr);
+			return;
+		}
+	}
+}