added boot script files to repository

4 files changed, 621 insertions, 0 deletions

diff --git a/u-boot/board/bf527-ezkit/Makefile b/u-boot/board/bf527-ezkit/Makefile
new file mode 100644
index 0000000..98a8121
--- /dev/null
+++ b/u-boot/board/bf527-ezkit/Makefile
@@ -0,0 +1,55 @@
+#
+# U-boot - Makefile
+#
+# Copyright (c) 2005-2008 Analog Device Inc.
+#
+# (C) Copyright 2000-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# 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 $(TOPDIR)/config.mk
+
+LIB	= $(obj)lib$(BOARD).o
+
+COBJS-y	:= $(BOARD).o
+COBJS-$(CONFIG_VIDEO)      += video.o
+
+SRCS	:= $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS-y))
+SOBJS	:= $(addprefix $(obj),$(SOBJS-y))
+
+$(LIB):	$(obj).depend $(OBJS) $(SOBJS)
+	$(call cmd_link_o_target, $(OBJS) $(SOBJS))
+
+clean:
+	rm -f $(SOBJS) $(OBJS)
+
+distclean:	clean
+	rm -f $(LIB) core *.bak $(obj).depend
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/u-boot/board/bf527-ezkit/bf527-ezkit.c b/u-boot/board/bf527-ezkit/bf527-ezkit.c
new file mode 100644
index 0000000..211cf24
--- /dev/null
+++ b/u-boot/board/bf527-ezkit/bf527-ezkit.c
@@ -0,0 +1,82 @@
+/*
+ * U-boot - main board file
+ *
+ * Copyright (c) 2005-2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+#include <config.h>
+#include <command.h>
+#include <net.h>
+#include <netdev.h>
+#include <asm/blackfin.h>
+#include <asm/gpio.h>
+#include <asm/net.h>
+#include <asm/mach-common/bits/otp.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int checkboard(void)
+{
+	printf("Board: ADI BF527 EZ-Kit board\n");
+	printf("       Support: http://blackfin.uclinux.org/\n");
+	return 0;
+}
+
+#ifdef CONFIG_BFIN_MAC
+static void board_init_enetaddr(uchar *mac_addr)
+{
+	bool valid_mac = false;
+
+	/* the MAC is stored in OTP memory page 0xDF */
+	uint32_t ret;
+	uint64_t otp_mac;
+
+	ret = bfrom_OtpRead(0xDF, OTP_LOWER_HALF, &otp_mac);
+	if (!(ret & OTP_MASTER_ERROR)) {
+		uchar *otp_mac_p = (uchar *)&otp_mac;
+
+		for (ret = 0; ret < 6; ++ret)
+			mac_addr[ret] = otp_mac_p[5 - ret];
+
+		if (is_valid_ether_addr(mac_addr))
+			valid_mac = true;
+	}
+
+	if (!valid_mac) {
+		puts("Warning: Generating 'random' MAC address\n");
+		bfin_gen_rand_mac(mac_addr);
+	}
+
+	eth_setenv_enetaddr("ethaddr", mac_addr);
+}
+
+int board_eth_init(bd_t *bis)
+{
+	return bfin_EMAC_initialize(bis);
+}
+#endif
+
+int misc_init_r(void)
+{
+#ifdef CONFIG_BFIN_MAC
+	uchar enetaddr[6];
+	if (!eth_getenv_enetaddr("ethaddr", enetaddr))
+		board_init_enetaddr(enetaddr);
+#endif
+
+	return 0;
+}
+
+#ifdef CONFIG_USB_BLACKFIN
+void board_musb_init(void)
+{
+	/*
+	 * BF527 EZ-KITs require PG13 to be high for HOST mode
+	 */
+	gpio_request(GPIO_PG13, "musb-vbus");
+	gpio_direction_output(GPIO_PG13, 1);
+}
+#endif
diff --git a/u-boot/board/bf527-ezkit/config.mk b/u-boot/board/bf527-ezkit/config.mk
new file mode 100644
index 0000000..790fe99
--- /dev/null
+++ b/u-boot/board/bf527-ezkit/config.mk
@@ -0,0 +1,35 @@
+#
+# Copyright (c) 2005-2008 Analog Device Inc.
+#
+# (C) Copyright 2001
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# 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
+#
+
+# This is not actually used for Blackfin boards so do not change it
+#CONFIG_SYS_TEXT_BASE = do-not-use-me
+
+CONFIG_BFIN_CPU = bf527-0.0
+
+CFLAGS_lib += -O2
+CFLAGS_lib/lzma += -O2
+
+# Set some default LDR flags based on boot mode.
+LDR_FLAGS += $(LDR_FLAGS-$(CONFIG_BFIN_BOOT_MODE))
diff --git a/u-boot/board/bf527-ezkit/video.c b/u-boot/board/bf527-ezkit/video.c
new file mode 100644
index 0000000..ca5e9b0
--- /dev/null
+++ b/u-boot/board/bf527-ezkit/video.c
@@ -0,0 +1,449 @@
+/*
+ * video.c - run splash screen on lcd
+ *
+ * Copyright (c) 2007-2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <stdarg.h>
+#include <common.h>
+#include <config.h>
+#include <malloc.h>
+#include <asm/blackfin.h>
+#include <asm/portmux.h>
+#include <asm/mach-common/bits/dma.h>
+#include <spi.h>
+#include <linux/types.h>
+#include <stdio_dev.h>
+
+#include <asm/mach-common/bits/ppi.h>
+#include <asm/mach-common/bits/timer.h>
+
+#define LCD_X_RES		320	/* Horizontal Resolution */
+#define LCD_Y_RES		240	/* Vertical Resolution */
+#define DMA_BUS_SIZE		16
+
+#ifdef CONFIG_BF527_EZKIT_REV_2_1 /* lq035q1 */
+
+#if !defined(CONFIG_LQ035Q1_USE_RGB888_8_BIT_PPI) && \
+    !defined(CONFIG_LQ035Q1_USE_RGB565_8_BIT_PPI)
+# define CONFIG_LQ035Q1_USE_RGB565_8_BIT_PPI
+#endif
+
+/* Interface 16/18-bit TFT over an 8-bit wide PPI using a
+ * small Programmable Logic Device (CPLD)
+ * http://blackfin.uclinux.org/gf/project/stamp/frs/?action=FrsReleaseBrowse&frs_package_id=165
+ */
+
+#ifdef CONFIG_LQ035Q1_USE_RGB565_8_BIT_PPI
+#include <asm/bfin_logo_rgb565_230x230.h>
+#define LCD_BPP		16	/* Bit Per Pixel */
+#define CLOCKS_PPIX	2	/* Clocks per pixel */
+#define CPLD_DELAY	3	/* RGB565 pipeline delay */
+#endif
+
+#ifdef CONFIG_LQ035Q1_USE_RGB888_8_BIT_PPI
+#include <asm/bfin_logo_230x230.h>
+#define LCD_BPP		24	/* Bit Per Pixel */
+#define CLOCKS_PPIX	3	/* Clocks per pixel */
+#define CPLD_DELAY	5	/* RGB888 pipeline delay */
+#endif
+
+/*
+ * HS and VS timing parameters (all in number of PPI clk ticks)
+ */
+
+#define H_ACTPIX	(LCD_X_RES * CLOCKS_PPIX)	/* active horizontal pixel */
+#define H_PERIOD	(336 * CLOCKS_PPIX)		/* HS period */
+#define H_PULSE		(2 * CLOCKS_PPIX)		/* HS pulse width */
+#define H_START		(7 * CLOCKS_PPIX + CPLD_DELAY)	/* first valid pixel */
+
+#define U_LINE		4				/* Blanking Lines */
+
+#define V_LINES		(LCD_Y_RES + U_LINE)		/* total vertical lines */
+#define V_PULSE		(2 * CLOCKS_PPIX)		/* VS pulse width (1-5 H_PERIODs) */
+#define V_PERIOD	(H_PERIOD * V_LINES)		/* VS period */
+
+#define ACTIVE_VIDEO_MEM_OFFSET	((U_LINE / 2) * LCD_X_RES * (LCD_BPP / 8))
+
+/*
+ * LCD Modes
+ */
+#define LQ035_RL	(0 << 8)	/* Right -> Left Scan */
+#define LQ035_LR	(1 << 8)	/* Left -> Right Scan */
+#define LQ035_TB	(1 << 9)	/* Top -> Botton Scan */
+#define LQ035_BT	(0 << 9)	/* Botton -> Top Scan */
+#define LQ035_BGR	(1 << 11)	/* Use BGR format */
+#define LQ035_RGB	(0 << 11)	/* Use RGB format */
+#define LQ035_NORM	(1 << 13)	/* Reversal */
+#define LQ035_REV	(0 << 13)	/* Reversal */
+
+#define LQ035_INDEX			0x74
+#define LQ035_DATA			0x76
+
+#define LQ035_DRIVER_OUTPUT_CTL		0x1
+#define LQ035_SHUT_CTL			0x11
+
+#define LQ035_DRIVER_OUTPUT_MASK	(LQ035_LR | LQ035_TB | LQ035_BGR | LQ035_REV)
+#define LQ035_DRIVER_OUTPUT_DEFAULT	(0x2AEF & ~LQ035_DRIVER_OUTPUT_MASK)
+
+#define LQ035_SHUT			(1 << 0)	/* Shutdown */
+#define LQ035_ON			(0 << 0)	/* Shutdown */
+
+#ifndef CONFIG_LQ035Q1_LCD_MODE
+#define CONFIG_LQ035Q1_LCD_MODE		(LQ035_NORM | LQ035_RL | LQ035_TB | LQ035_BGR)
+#endif
+
+#else /* t350mcqb */
+#include <asm/bfin_logo_230x230.h>
+
+#define LCD_BPP		24	/* Bit Per Pixel */
+#define CLOCKS_PPIX	3	/* Clocks per pixel */
+
+/* HS and VS timing parameters (all in number of PPI clk ticks) */
+#define H_ACTPIX	(LCD_X_RES * CLOCKS_PPIX)	/* active horizontal pixel */
+#define H_PERIOD	(408 * CLOCKS_PPIX)		/* HS period */
+#define H_PULSE		90				/* HS pulse width */
+#define H_START		204				/* first valid pixel */
+
+#define U_LINE		1				/* Blanking Lines */
+
+#define V_LINES		(LCD_Y_RES + U_LINE)		/* total vertical lines */
+#define V_PULSE		(3 * H_PERIOD)			/* VS pulse width (1-5 H_PERIODs) */
+#define V_PERIOD	(H_PERIOD * V_LINES)		/* VS period */
+
+#define ACTIVE_VIDEO_MEM_OFFSET	(U_LINE * H_ACTPIX)
+#endif
+
+#define LCD_PIXEL_SIZE		(LCD_BPP / 8)
+#define DMA_SIZE16		2
+
+#define PPI_TX_MODE		0x2
+#define PPI_XFER_TYPE_11	0xC
+#define PPI_PORT_CFG_01		0x10
+#define PPI_PACK_EN		0x80
+#define PPI_POLS_1		0x8000
+
+#ifdef CONFIG_BF527_EZKIT_REV_2_1
+static struct spi_slave *slave;
+static int lq035q1_control(unsigned char reg, unsigned short value)
+{
+	int ret;
+	u8 regs[3] = {LQ035_INDEX, 0, 0};
+	u8 data[3] = {LQ035_DATA, 0, 0};
+	u8 dummy[3];
+
+	regs[2] = reg;
+	data[1] = value >> 8;
+	data[2] = value & 0xFF;
+
+	if (!slave) {
+		/* FIXME: Verify the max SCK rate */
+		slave = spi_setup_slave(CONFIG_LQ035Q1_SPI_BUS,
+				CONFIG_LQ035Q1_SPI_CS, 20000000,
+				SPI_MODE_3);
+		if (!slave)
+			return -1;
+	}
+
+	if (spi_claim_bus(slave))
+		return -1;
+
+	ret = spi_xfer(slave, 24, regs, dummy, SPI_XFER_BEGIN | SPI_XFER_END);
+	ret |= spi_xfer(slave, 24, data, dummy, SPI_XFER_BEGIN | SPI_XFER_END);
+
+	spi_release_bus(slave);
+
+	return ret;
+}
+#endif
+
+/* enable and disable PPI functions */
+void EnablePPI(void)
+{
+	bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() | PORT_EN);
+}
+
+void DisablePPI(void)
+{
+	bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() & ~PORT_EN);
+}
+
+void Init_Ports(void)
+{
+	const unsigned short pins[] = {
+		P_PPI0_D0, P_PPI0_D1, P_PPI0_D2, P_PPI0_D3, P_PPI0_D4,
+		P_PPI0_D5, P_PPI0_D6, P_PPI0_D7, P_PPI0_FS2, 0,
+	};
+	peripheral_request_list(pins, "lcd");
+}
+
+void Init_PPI(void)
+{
+
+	bfin_write_PPI_DELAY(H_START);
+	bfin_write_PPI_COUNT(H_ACTPIX - 1);
+	bfin_write_PPI_FRAME(V_LINES);
+
+	/* PPI control, to be replaced with definitions */
+	bfin_write_PPI_CONTROL(
+			PPI_TX_MODE		|	/* output mode , PORT_DIR */
+			PPI_XFER_TYPE_11	|	/* sync mode XFR_TYPE */
+			PPI_PORT_CFG_01		|	/* two frame sync PORT_CFG */
+			PPI_PACK_EN		|	/* packing enabled PACK_EN */
+			PPI_POLS_1			/* faling edge syncs POLS */
+	);
+}
+
+void Init_DMA(void *dst)
+{
+	bfin_write_DMA0_START_ADDR(dst);
+
+	/* X count */
+	bfin_write_DMA0_X_COUNT(H_ACTPIX / 2);
+	bfin_write_DMA0_X_MODIFY(DMA_BUS_SIZE / 8);
+
+	/* Y count */
+	bfin_write_DMA0_Y_COUNT(V_LINES);
+	bfin_write_DMA0_Y_MODIFY(DMA_BUS_SIZE / 8);
+
+	/* DMA Config */
+	bfin_write_DMA0_CONFIG(
+		WDSIZE_16	|	/* 16 bit DMA */
+		DMA2D 		|	/* 2D DMA */
+		FLOW_AUTO		/* autobuffer mode */
+	);
+}
+
+void EnableDMA(void)
+{
+	bfin_write_DMA0_CONFIG(bfin_read_DMA0_CONFIG() | DMAEN);
+}
+
+void DisableDMA(void)
+{
+	bfin_write_DMA0_CONFIG(bfin_read_DMA0_CONFIG() & ~DMAEN);
+}
+
+/* Init TIMER0 as Frame Sync 1 generator */
+void InitTIMER0(void)
+{
+	bfin_write_TIMER_DISABLE(TIMDIS0);			/* disable Timer */
+	SSYNC();
+	bfin_write_TIMER_STATUS(TIMIL0 | TOVF_ERR0 | TRUN0);	/* clear status */
+	SSYNC();
+
+	bfin_write_TIMER0_PERIOD(H_PERIOD);
+	SSYNC();
+	bfin_write_TIMER0_WIDTH(H_PULSE);
+	SSYNC();
+
+	bfin_write_TIMER0_CONFIG(
+				PWM_OUT |
+				PERIOD_CNT   |
+				TIN_SEL      |
+				CLK_SEL      |
+				EMU_RUN
+	);
+	SSYNC();
+}
+
+void EnableTIMER0(void)
+{
+	bfin_write_TIMER_ENABLE(TIMEN0);
+	SSYNC();
+}
+
+void DisableTIMER0(void)
+{
+	bfin_write_TIMER_DISABLE(TIMDIS0);
+	SSYNC();
+}
+
+
+void InitTIMER1(void)
+{
+	bfin_write_TIMER_DISABLE(TIMDIS1);			/* disable Timer */
+	SSYNC();
+	bfin_write_TIMER_STATUS(TIMIL1 | TOVF_ERR1 | TRUN1);	/* clear status */
+	SSYNC();
+
+	bfin_write_TIMER1_PERIOD(V_PERIOD);
+	SSYNC();
+	bfin_write_TIMER1_WIDTH(V_PULSE);
+	SSYNC();
+
+	bfin_write_TIMER1_CONFIG(
+				PWM_OUT |
+				PERIOD_CNT   |
+				TIN_SEL      |
+				CLK_SEL      |
+				EMU_RUN
+	);
+	SSYNC();
+}
+
+void EnableTIMER1(void)
+{
+	bfin_write_TIMER_ENABLE(TIMEN1);
+	SSYNC();
+}
+
+void DisableTIMER1(void)
+{
+	bfin_write_TIMER_DISABLE(TIMDIS1);
+	SSYNC();
+}
+
+void EnableTIMER12(void)
+{
+	bfin_write_TIMER_ENABLE(TIMEN1 | TIMEN0);
+	SSYNC();
+}
+
+int video_init(void *dst)
+{
+
+#ifdef CONFIG_BF527_EZKIT_REV_2_1
+	lq035q1_control(LQ035_SHUT_CTL, LQ035_ON);
+	lq035q1_control(LQ035_DRIVER_OUTPUT_CTL, (CONFIG_LQ035Q1_LCD_MODE &
+		LQ035_DRIVER_OUTPUT_MASK) | LQ035_DRIVER_OUTPUT_DEFAULT);
+#endif
+	Init_Ports();
+	Init_DMA(dst);
+	EnableDMA();
+	InitTIMER0();
+	InitTIMER1();
+	Init_PPI();
+	EnablePPI();
+
+#ifdef CONFIG_BF527_EZKIT_REV_2_1
+	EnableTIMER12();
+#else
+	/* Frame sync 2 (VS) needs to start at least one PPI clk earlier */
+	EnableTIMER1();
+	/* Add Some Delay ... */
+	SSYNC();
+	SSYNC();
+	SSYNC();
+	SSYNC();
+
+	/* now start frame sync 1 */
+	EnableTIMER0();
+#endif
+
+	return 0;
+}
+
+static void dma_bitblit(void *dst, fastimage_t *logo, int x, int y)
+{
+	if (dcache_status())
+		blackfin_dcache_flush_range(logo->data, logo->data + logo->size);
+
+	bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
+
+	/* Setup destination start address */
+	bfin_write_MDMA_D0_START_ADDR(dst + ((x & -2) * LCD_PIXEL_SIZE)
+					+ (y * LCD_X_RES * LCD_PIXEL_SIZE));
+	/* Setup destination xcount */
+	bfin_write_MDMA_D0_X_COUNT(logo->width * LCD_PIXEL_SIZE / DMA_SIZE16);
+	/* Setup destination xmodify */
+	bfin_write_MDMA_D0_X_MODIFY(DMA_SIZE16);
+
+	/* Setup destination ycount */
+	bfin_write_MDMA_D0_Y_COUNT(logo->height);
+	/* Setup destination ymodify */
+	bfin_write_MDMA_D0_Y_MODIFY((LCD_X_RES - logo->width) * LCD_PIXEL_SIZE + DMA_SIZE16);
+
+
+	/* Setup Source start address */
+	bfin_write_MDMA_S0_START_ADDR(logo->data);
+	/* Setup Source xcount */
+	bfin_write_MDMA_S0_X_COUNT(logo->width * LCD_PIXEL_SIZE / DMA_SIZE16);
+	/* Setup Source xmodify */
+	bfin_write_MDMA_S0_X_MODIFY(DMA_SIZE16);
+
+	/* Setup Source ycount */
+	bfin_write_MDMA_S0_Y_COUNT(logo->height);
+	/* Setup Source ymodify */
+	bfin_write_MDMA_S0_Y_MODIFY(DMA_SIZE16);
+
+
+	/* Enable source DMA */
+	bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_16 | DMA2D);
+	SSYNC();
+	bfin_write_MDMA_D0_CONFIG(WNR | DMAEN  | WDSIZE_16 | DMA2D);
+
+	while (bfin_read_MDMA_D0_IRQ_STATUS() & DMA_RUN);
+
+	bfin_write_MDMA_S0_IRQ_STATUS(bfin_read_MDMA_S0_IRQ_STATUS() | DMA_DONE | DMA_ERR);
+	bfin_write_MDMA_D0_IRQ_STATUS(bfin_read_MDMA_D0_IRQ_STATUS() | DMA_DONE | DMA_ERR);
+
+}
+
+void video_stop(void)
+{
+	DisablePPI();
+	DisableDMA();
+	DisableTIMER0();
+	DisableTIMER1();
+#ifdef CONFIG_BF527_EZKIT_REV_2_1
+	lq035q1_control(LQ035_SHUT_CTL, LQ035_SHUT);
+#endif
+}
+
+void video_putc(const char c)
+{
+}
+
+void video_puts(const char *s)
+{
+}
+
+int drv_video_init(void)
+{
+	int error, devices = 1;
+	struct stdio_dev videodev;
+
+	u8 *dst;
+	u32 fbmem_size = LCD_X_RES * LCD_Y_RES * LCD_PIXEL_SIZE + ACTIVE_VIDEO_MEM_OFFSET;
+
+	dst = malloc(fbmem_size);
+
+	if (dst == NULL) {
+		printf("Failed to alloc FB memory\n");
+		return -1;
+	}
+
+#ifdef EASYLOGO_ENABLE_GZIP
+	unsigned char *data = EASYLOGO_DECOMP_BUFFER;
+	unsigned long src_len = EASYLOGO_ENABLE_GZIP;
+	if (gunzip(data, bfin_logo.size, bfin_logo.data, &src_len)) {
+		puts("Failed to decompress logo\n");
+		free(dst);
+		return -1;
+	}
+	bfin_logo.data = data;
+#endif
+
+	memset(dst + ACTIVE_VIDEO_MEM_OFFSET, bfin_logo.data[0], fbmem_size - ACTIVE_VIDEO_MEM_OFFSET);
+
+	dma_bitblit(dst + ACTIVE_VIDEO_MEM_OFFSET, &bfin_logo,
+			(LCD_X_RES - bfin_logo.width) / 2,
+			(LCD_Y_RES - bfin_logo.height) / 2);
+
+	video_init(dst);		/* Video initialization */
+
+	memset(&videodev, 0, sizeof(videodev));
+
+	strcpy(videodev.name, "video");
+	videodev.ext = DEV_EXT_VIDEO;	/* Video extensions */
+	videodev.flags = DEV_FLAGS_SYSTEM;	/* No Output */
+	videodev.putc = video_putc;	/* 'putc' function */
+	videodev.puts = video_puts;	/* 'puts' function */
+
+	error = stdio_register(&videodev);
+
+	return (error == 0) ? devices : error;
+}