SPL: Add YMODEM over UART load support

Adds support for loading U-Boot from UART using YMODEM protocol.
If YMODEM support is enabled in SPL and the romcode indicates
that SPL loaded via UART then SPL will wait for start of a
YMODEM transfer via the console port.

Signed-off-by: Matt Porter <mporter@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>

arch/arm/cpu/armv7/omap-common/Makefile

@@ -52,6 +52,9 @@ endif
 ifdef CONFIG_SPL_MMC_SUPPORT
 COBJS	+= spl_mmc.o
 endif
+ifdef CONFIG_SPL_YMODEM_SUPPORT
+COBJS	+= spl_ymodem.o
+endif
 endif
 
 ifndef CONFIG_SPL_BUILD

arch/arm/cpu/armv7/omap-common/spl.c

@@ -132,6 +132,11 @@ void board_init_r(gd_t *id, ulong dummy)
 	case BOOT_DEVICE_NAND:
 		spl_nand_load_image();
 		break;
+#endif
+#ifdef CONFIG_SPL_YMODEM_SUPPORT
+	case BOOT_DEVICE_UART:
+		spl_ymodem_load_image();
+		break;
 #endif
 	default:
 		printf("SPL: Un-supported Boot Device - %d!!!\n", boot_device);

arch/arm/cpu/armv7/omap-common/spl_ymodem.c

@@ -0,0 +1,76 @@
+/*
+ * (C) Copyright 2000-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (C) Copyright 2011
+ * Texas Instruments, <www.ti.com>
+ *
+ * Matt Porter <mporter@ti.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+#include <common.h>
+#include <xyzModem.h>
+#include <asm/u-boot.h>
+#include <asm/utils.h>
+#include <asm/arch/sys_proto.h>
+#include <asm/omap_common.h>
+
+#define BUF_SIZE 1024
+
+static int getcymodem(void) {
+	if (tstc())
+		return (getc());
+	return -1;
+}
+
+void spl_ymodem_load_image(void)
+{
+	int size = 0;
+	int err;
+	int res;
+	int ret;
+	connection_info_t info;
+	char buf[BUF_SIZE];
+	ulong store_addr = ~0;
+	ulong addr = 0;
+
+	info.mode = xyzModem_ymodem;
+	ret = xyzModem_stream_open(&info, &err);
+
+	if (!ret) {
+		while ((res =
+			xyzModem_stream_read(buf, BUF_SIZE, &err)) > 0) {
+			if (addr == 0)
+				spl_parse_image_header((struct image_header *)buf);
+			store_addr = addr + spl_image.load_addr;
+			size += res;
+			addr += res;
+			memcpy((char *)(store_addr), buf, res);
+		}
+	} else {
+		printf("spl: ymodem err - %s\n", xyzModem_error(err));
+		hang();
+	}
+
+	xyzModem_stream_close(&err);
+	xyzModem_stream_terminate(false, &getcymodem);
+
+	printf("Loaded %d bytes\n", size);
+}

arch/arm/include/asm/omap_common.h

@@ -99,6 +99,9 @@ void spl_nand_load_image(void);
 /* MMC SPL functions */
 void spl_mmc_load_image(void);
 
+/* YMODEM SPL functions */
+void spl_ymodem_load_image(void);
+
 #ifdef CONFIG_SPL_BOARD_INIT
 void spl_board_init(void);
 #endif

common/Makefile

@@ -185,6 +185,9 @@ COBJS-$(CONFIG_UPDATE_TFTP) += update.o
 COBJS-$(CONFIG_USB_KEYBOARD) += usb_kbd.o
 endif
 
+ifdef CONFIG_SPL_BUILD
+COBJS-$(CONFIG_SPL_YMODEM_SUPPORT) += xyzModem.o
+endif
 COBJS-y += console.o
 COBJS-y += dlmalloc.o
 COBJS-y += memsize.o

lib/Makefile

@@ -55,6 +55,9 @@ else
 COBJS-$(CONFIG_SPL_SPI_FLASH_SUPPORT) += display_options.o
 endif
 
+ifdef CONFIG_SPL_BUILD
+COBJS-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16.o
+endif
 COBJS-y += ctype.o
 COBJS-y += div64.o
 COBJS-y += string.o