xtensa flash: minimal KC705 support

- dummy flash driver for KC705/ML605
- experimental updates to board .cfg file
- flash erase, write support w/ 32-byte buffering (LX)
- algo support manually verified (NX)

Signed-off-by: ianst <ianst@cadence.com>

contrib/loaders/flash/xtensa/Makefile

@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+BIN2C = ../../../../src/helper/bin2char.sh
+
+CROSS_COMPILE ?= xt-
+
+CC=$(CROSS_COMPILE)clang
+OBJCOPY=$(CROSS_COMPILE)objcopy
+OBJDUMP=$(CROSS_COMPILE)objdump
+
+AFLAGS = -c -static -nostartfiles -mlittle-endian -mtext-section-literals
+CFLAGS = -c -nostdlib -nostartfiles -Os -g -fPIC
+
+all: xtkcml705fl.inc
+
+.PHONY: clean
+
+%.elf: %.S
+	$(CC) $(AFLAGS) $< -o $@
+
+%.lst: %.elf
+	$(OBJDUMP) -S $< > $@
+
+%.bin: %.elf
+	$(OBJCOPY) -Obinary $< $@
+
+%.inc: %.bin
+	$(BIN2C) < $< > $@
+
+clean:
+	-rm -f *.elf *.lst *.bin *.inc

contrib/loaders/flash/xtensa/xtkcml705fl.S

@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/***************************************************************************
+ *   Xtensa flasher for KC705/ML605 platforms
+ *   Copyright (C) 2023 Cadence Design Systems
+ ***************************************************************************/
+
+/*
+ * Parameters:
+ * a10 = flash base (in), status (out)
+ * a11 = count (halfword-16bit)
+ * a12 = buffer start
+ * a13 = buffer end / scratch register
+ * a14 = target address
+ *
+ * NOTE: if count does not indicate a multiple of 32 bytes, this logic
+ * will round up to and program the next multiple of 32 bytes.
+ */
+    .text
+
+    .align  4
+_flash_prog_start:
+	j	_flash_prog
+
+	.align 4
+	.literal_position
+
+_flash_prog:
+	movi	a13, 0x50		/* clear flash status register */
+	s16i	a13, a10, 0
+
+_flash_prog_loop:
+	movi	a13, 0xe8		/* set flash into buffer program mode */
+	s16i	a13, a14, 0
+	movi	a13, 31			/* always program chunks of N=32 bytes (write N-1) */
+	s16i	a13, a14, 0
+	.set	i, 0
+	.rept	32
+		l16ui	a13, a12, i
+		s16i	a13, a14, i
+		.set	i, i+2
+	.endr
+	movi	a13, 32
+	sub		a11, a11, a13	/* increment half-word count */
+	add		a13, a13, a13	/* double a13 for incrementing buffer/target addresses */
+	add		a12, a12, a13
+	add		a14, a14, a13
+	movi    a13, 0xd0		/* end buffer program mode */
+	s16i	a13, a14, 0
+_flash_prog_status_check:
+	l16ui	a13, a10, 0
+	bbci	a13, 7, _flash_prog_status_check
+	extui	a13, a13, 0, 7
+	bnez	a13, _flash_prog_error
+	bgei	a11, 1, _flash_prog_loop
+
+_flash_prog_done:
+    /* TODO: set program mode size of -1? */
+    movi	a13, 0x50		/* clear status register */
+    s16i	a13, a10, 0
+    movi	a13, 0xff		/* restore read array (normal) mode */
+    s16i	a13, a10, 0
+    movi	a10, 0
+    break	0, 0			/* Coded breakpoint at end of algo */
+_flash_prog_error:
+    movi	a10, -4
+    break	0, 0			/* Coded breakpoint at end of algo */
+
+_idle_loop:
+    j _idle_loop
+

contrib/loaders/flash/xtensa/xtkcml705fl.inc

@@ -0,0 +1,18 @@
+/* Autogenerated with ../../../../src/helper/bin2char.sh */
+0x06,0x00,0x00,0x00,0x5c,0x0d,0xd2,0x5a,0x00,0xd2,0xa0,0xe8,0xd2,0x5e,0x00,0x1c,
+0xfd,0xd2,0x5e,0x00,0xd2,0x1c,0x00,0xd2,0x5e,0x00,0xd2,0x1c,0x01,0xd2,0x5e,0x01,
+0xd2,0x1c,0x02,0xd2,0x5e,0x02,0xd2,0x1c,0x03,0xd2,0x5e,0x03,0xd2,0x1c,0x04,0xd2,
+0x5e,0x04,0xd2,0x1c,0x05,0xd2,0x5e,0x05,0xd2,0x1c,0x06,0xd2,0x5e,0x06,0xd2,0x1c,
+0x07,0xd2,0x5e,0x07,0xd2,0x1c,0x08,0xd2,0x5e,0x08,0xd2,0x1c,0x09,0xd2,0x5e,0x09,
+0xd2,0x1c,0x0a,0xd2,0x5e,0x0a,0xd2,0x1c,0x0b,0xd2,0x5e,0x0b,0xd2,0x1c,0x0c,0xd2,
+0x5e,0x0c,0xd2,0x1c,0x0d,0xd2,0x5e,0x0d,0xd2,0x1c,0x0e,0xd2,0x5e,0x0e,0xd2,0x1c,
+0x0f,0xd2,0x5e,0x0f,0xd2,0x1c,0x10,0xd2,0x5e,0x10,0xd2,0x1c,0x11,0xd2,0x5e,0x11,
+0xd2,0x1c,0x12,0xd2,0x5e,0x12,0xd2,0x1c,0x13,0xd2,0x5e,0x13,0xd2,0x1c,0x14,0xd2,
+0x5e,0x14,0xd2,0x1c,0x15,0xd2,0x5e,0x15,0xd2,0x1c,0x16,0xd2,0x5e,0x16,0xd2,0x1c,
+0x17,0xd2,0x5e,0x17,0xd2,0x1c,0x18,0xd2,0x5e,0x18,0xd2,0x1c,0x19,0xd2,0x5e,0x19,
+0xd2,0x1c,0x1a,0xd2,0x5e,0x1a,0xd2,0x1c,0x1b,0xd2,0x5e,0x1b,0xd2,0x1c,0x1c,0xd2,
+0x5e,0x1c,0xd2,0x1c,0x1d,0xd2,0x5e,0x1d,0xd2,0x1c,0x1e,0xd2,0x5e,0x1e,0xd2,0x1c,
+0x1f,0xd2,0x5e,0x1f,0x2c,0x0d,0xd0,0xbb,0xc0,0xda,0xdd,0xda,0xcc,0xda,0xee,0xd2,
+0xa0,0xd0,0xd2,0x5e,0x00,0xd2,0x1a,0x00,0x77,0x6d,0xf9,0xd0,0xd0,0x64,0xdc,0x4d,
+0xa6,0x1b,0x02,0x86,0xc4,0xff,0x5c,0x0d,0xd2,0x5a,0x00,0xd2,0xa0,0xff,0xd2,0x5a,
+0x00,0x0c,0x0a,0x00,0x40,0x00,0x7c,0xca,0x00,0x40,0x00,0x06,0xff,0xff,

src/flash/nor/Makefile.am

@@ -79,7 +79,8 @@ NOR_DRIVERS = \
 	%D%/w600.c \
 	%D%/xcf.c \
 	%D%/xmc1xxx.c \
-	%D%/xmc4xxx.c
+	%D%/xmc4xxx.c \
+	%D%/xtkcml705fl.c
 
 NORHEADERS = \
 	%D%/core.h \

src/flash/nor/driver.h

@@ -308,5 +308,6 @@ extern const struct flash_driver w600_flash;
 extern const struct flash_driver xcf_flash;
 extern const struct flash_driver xmc1xxx_flash;
 extern const struct flash_driver xmc4xxx_flash;
+extern const struct flash_driver xtkcml705fl_flash;
 
 #endif /* OPENOCD_FLASH_NOR_DRIVER_H */

src/flash/nor/drivers.c

@@ -85,6 +85,7 @@ static const struct flash_driver * const flash_drivers[] = {
 	&xmc4xxx_flash,
 	&w600_flash,
 	&rsl10_flash,
+	&xtkcml705fl_flash,
 	NULL,
 };