board/esd/plu405/plu405.c - filogic/uboot - Gitiles

 /*
  * (C) Copyright 2001-2003
  * Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.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 <asm/processor.h>
 #include <asm/io.h>
 #include <command.h>
 #include <malloc.h>
 #include <sja1000.h>

 #undef FPGA_DEBUG

 DECLARE_GLOBAL_DATA_PTR;

 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
 extern void lxt971_no_sleep(void);

 /* fpga configuration data - gzip compressed and generated by bin2c */
 const unsigned char fpgadata[] =
 {
 #include "fpgadata.c"
 };

 /*
  * include common fpga code (for esd boards)
  */
 #include "../common/fpga.c"

 /*
  * generate a short spike on the CAN tx line
  * to bring the couplers in sync
  */
 void init_coupler(u32 addr)
 {
 	struct sja1000_basic_s *ctrl = (struct sja1000_basic_s *)addr;

 	/* reset */
 	out_8(&ctrl->cr, CR_RR);

 	/* dominant */
 	out_8(&ctrl->btr0, 0x00); /* btr setup is required */
 	out_8(&ctrl->btr1, 0x14); /* we use 1Mbit/s */
 	out_8(&ctrl->oc, OC_TP1 | OC_TN1 | OC_POL1 |
 	      OC_TP0 | OC_TN0 | OC_POL0 | OC_MODE1);
 	out_8(&ctrl->cr, 0x00);

 	/* delay */
 	in_8(&ctrl->cr);
 	in_8(&ctrl->cr);
 	in_8(&ctrl->cr);
 	in_8(&ctrl->cr);

 	/* reset */
 	out_8(&ctrl->cr, CR_RR);
 }

 int board_early_init_f(void)
 {
 	/*
 	 * IRQ 0-15  405GP internally generated; active high; level sensitive
 	 * IRQ 16    405GP internally generated; active low; level sensitive
 	 * IRQ 17-24 RESERVED
 	 * IRQ 25 (EXT IRQ 0) CAN0; active low; level sensitive
 	 * IRQ 26 (EXT IRQ 1) SER0 ; active low; level sensitive
 	 * IRQ 27 (EXT IRQ 2) SER1; active low; level sensitive
 	 * IRQ 28 (EXT IRQ 3) FPGA 0; active low; level sensitive
 	 * IRQ 29 (EXT IRQ 4) FPGA 1; active low; level sensitive
 	 * IRQ 30 (EXT IRQ 5) PCI INTA; active low; level sensitive
 	 * IRQ 31 (EXT IRQ 6) COMPACT FLASH; active high; level sensitive
 	 */
 	mtdcr(UIC0SR, 0xFFFFFFFF);       /* clear all ints */
 	mtdcr(UIC0ER, 0x00000000);       /* disable all ints */
 	mtdcr(UIC0CR, 0x00000000);       /* set all to be non-critical*/
 	mtdcr(UIC0PR, 0xFFFFFF99);       /* set int polarities */
 	mtdcr(UIC0TR, 0x10000000);       /* set int trigger levels */
 	mtdcr(UIC0VCR, 0x00000001);      /* set vect base=0,INT0 highest prio */
 	mtdcr(UIC0SR, 0xFFFFFFFF);       /* clear all ints */

 	/*
 	 * EBC Configuration Register: set ready timeout to
 	 * 512 ebc-clks -> ca. 15 us
 	 */
 	mtebc(EBC0_CFG, 0xa8400000); /* ebc always driven */

 	return 0;
 }

 int misc_init_r(void)
 {
 	unsigned char *dst;
 	unsigned char fctr;
 	ulong len = sizeof(fpgadata);
 	int status;
 	int index;
 	int i;

 	/* adjust flash start and offset */
 	gd->bd->bi_flashstart = 0 - gd->bd->bi_flashsize;
 	gd->bd->bi_flashoffset = 0;

 	dst = malloc(CONFIG_SYS_FPGA_MAX_SIZE);
 	if (gunzip(dst, CONFIG_SYS_FPGA_MAX_SIZE,
 		   (uchar *)fpgadata, &len) != 0) {
 		printf("GUNZIP ERROR - must RESET board to recover\n");
 		do_reset(NULL, 0, 0, NULL);
 	}

 	status = fpga_boot(dst, len);
 	if (status != 0) {
 		printf("\nFPGA: Booting failed ");
 		switch (status) {
 		case ERROR_FPGA_PRG_INIT_LOW:
 			printf("(Timeout: INIT not low "
 			       "after asserting PROGRAM*)\n");
 			break;
 		case ERROR_FPGA_PRG_INIT_HIGH:
 			printf("(Timeout: INIT not high "
 			       "after deasserting PROGRAM*)\n");
 			break;
 		case ERROR_FPGA_PRG_DONE:
 			printf("(Timeout: DONE not high "
 			       "after programming FPGA)\n");
 			break;
 		}

 		/* display infos on fpgaimage */
 		index = 15;
 		for (i=0; i<4; i++) {
 			len = dst[index];
 			printf("FPGA: %s\n", &(dst[index+1]));
 			index += len+3;
 		}
 		putc ('\n');
 		/* delayed reboot */
 		for (i=20; i>0; i--) {
 			printf("Rebooting in %2d seconds \r",i);
 			for (index=0;index<1000;index++)
 				udelay(1000);
 		}
 		putc('\n');
 		do_reset(NULL, 0, 0, NULL);
 	}

 	puts("FPGA:  ");

 	/* display infos on fpgaimage */
 	index = 15;
 	for (i=0; i<4; i++) {
 		len = dst[index];
 		printf("%s ", &(dst[index+1]));
 		index += len+3;
 	}
 	putc('\n');

 	free(dst);

 	/*
 	 * Reset FPGA via FPGA_DATA pin
 	 */
 	SET_FPGA(FPGA_PRG | FPGA_CLK);
 	udelay(1000); /* wait 1ms */
 	SET_FPGA(FPGA_PRG | FPGA_CLK | FPGA_DATA);
 	udelay(1000); /* wait 1ms */

 	/*
 	 * Reset external DUARTs
 	 */
 	out_be32((void*)GPIO0_OR,
 		 in_be32((void*)GPIO0_OR) | CONFIG_SYS_DUART_RST);
 	udelay(10);
 	out_be32((void*)GPIO0_OR,
 		 in_be32((void*)GPIO0_OR) & ~CONFIG_SYS_DUART_RST);
 	udelay(1000);

 	/*
 	 * Set NAND-FLASH GPIO signals to default
 	 */
 	out_be32((void*)GPIO0_OR,
 		 in_be32((void*)GPIO0_OR) &
 		 ~(CONFIG_SYS_NAND_CLE | CONFIG_SYS_NAND_ALE));
 	out_be32((void*)GPIO0_OR,
 		 in_be32((void*)GPIO0_OR) | CONFIG_SYS_NAND_CE);

 	/*
 	 * Setup EEPROM write protection
 	 */
 	out_be32((void*)GPIO0_OR,
 		 in_be32((void*)GPIO0_OR) | CONFIG_SYS_EEPROM_WP);
 	out_be32((void*)GPIO0_TCR,
 		 in_be32((void*)GPIO0_TCR) | CONFIG_SYS_EEPROM_WP);

 	/*
 	 * Enable interrupts in exar duart mcr[3]
 	 */
 	out_8((void *)DUART0_BA + 4, 0x08);
 	out_8((void *)DUART1_BA + 4, 0x08);

 	/*
 	 * Enable auto RS485 mode in 2nd external uart
 	 */
 	out_8((void *)DUART1_BA + 3, 0xbf); /* write LCR */
 	fctr = in_8((void *)DUART1_BA + 1); /* read FCTR */
 	fctr |= 0x08;                       /* enable RS485 mode */
 	out_8((void *)DUART1_BA + 1, fctr); /* write FCTR */
 	out_8((void *)DUART1_BA + 3, 0);    /* write LCR */

 	/*
 	 * Init magnetic couplers
 	 */
 	if (!getenv("noinitcoupler")) {
 		init_coupler(CAN0_BA);
 		init_coupler(CAN1_BA);
 	}
 	return 0;
 }

 /*
  * Check Board Identity:
  */
 int checkboard(void)
 {
 	char str[64];
 	int i = getenv_r("serial#", str, sizeof(str));

 	puts("Board: ");

 	if (i == -1)
 		puts("### No HW ID - assuming PLU405");
 	else
 		puts(str);

 	putc('\n');
 	return 0;
 }

 #ifdef CONFIG_IDE_RESET
 #define FPGA_CTRL (CONFIG_SYS_FPGA_BASE_ADDR + CONFIG_SYS_FPGA_CTRL)
 void ide_set_reset(int on)
 {
 	/*
 	 * Assert or deassert CompactFlash Reset Pin
 	 */
 	if (on) {		/* assert RESET */
 		out_be16((void *)FPGA_CTRL,
 			 in_be16((void *)FPGA_CTRL) &
 			 ~CONFIG_SYS_FPGA_CTRL_CF_RESET);
 	} else {		/* release RESET */
 		out_be16((void *)FPGA_CTRL,
 			 in_be16((void *)FPGA_CTRL) |
 			 CONFIG_SYS_FPGA_CTRL_CF_RESET);
 	}
 }
 #endif /* CONFIG_IDE_RESET */

 void reset_phy(void)
 {
 #ifdef CONFIG_LXT971_NO_SLEEP

 	/*
 	 * Disable sleep mode in LXT971
 	 */
 	lxt971_no_sleep();
 #endif
 }

 #if defined(CONFIG_SYS_EEPROM_WREN)
 /* Input: <dev_addr>  I2C address of EEPROM device to enable.
  *	       <state> -1: deliver current state
  *			0: disable write
  *			1: enable write
  *  Returns:	       -1: wrong device address
  *			0: dis-/en- able done
  *		      0/1: current state if <state> was -1.
  */
 int eeprom_write_enable(unsigned dev_addr, int state)
 {
 	if (CONFIG_SYS_I2C_EEPROM_ADDR != dev_addr) {
 		return -1;
 	} else {
 		switch (state) {
 		case 1:
 			/* Enable write access, clear bit GPIO0. */
 			out_be32((void*)GPIO0_OR,
 				 in_be32((void*)GPIO0_OR) &
 				 ~CONFIG_SYS_EEPROM_WP);
 			state = 0;
 			break;
 		case 0:
 			/* Disable write access, set bit GPIO0. */
 			out_be32((void*)GPIO0_OR,
 				 in_be32((void*)GPIO0_OR) |
 				 CONFIG_SYS_EEPROM_WP);
 			state = 0;
 			break;
 		default:
 			/* Read current status back. */
 			state = ((in_be32((void*)GPIO0_OR) &
 				       CONFIG_SYS_EEPROM_WP) == 0);
 			break;
 		}
 	}
 	return state;
 }

 int do_eep_wren(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 {
 	int query = argc == 1;
 	int state = 0;

 	if (query) {
 		/* Query write access state. */
 		state = eeprom_write_enable(CONFIG_SYS_I2C_EEPROM_ADDR, -1);
 		if (state < 0) {
 			puts("Query of write access state failed.\n");
 		} else {
 			printf("Write access for device 0x%0x is %sabled.\n",
 			       CONFIG_SYS_I2C_EEPROM_ADDR,
 			       state ? "en" : "dis");
 			state = 0;
 		}
 	} else {
 		if (argv[1][0] == '0') {
 			/* Disable write access. */
 			state = eeprom_write_enable(CONFIG_SYS_I2C_EEPROM_ADDR,
 						    0);
 		} else {
 			/* Enable write access. */
 			state = eeprom_write_enable(CONFIG_SYS_I2C_EEPROM_ADDR,
 						    1);
 		}
 		if (state < 0)
 			puts("Setup of write access state failed.\n");
 	}

 	return state;
 }

 U_BOOT_CMD(eepwren,	2,	0,	do_eep_wren,
 	"Enable / disable / query EEPROM write access",
 	""
 );
 #endif /* #if defined(CONFIG_SYS_EEPROM_WREN) */
	/*
	* (C) Copyright 2001-2003
	* Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.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 <asm/processor.h>
	#include <asm/io.h>
	#include <command.h>
	#include <malloc.h>
	#include <sja1000.h>

	#undef FPGA_DEBUG

	DECLARE_GLOBAL_DATA_PTR;

	extern int do_reset (cmd_tbl_t cmdtp, int flag, int argc, char argv[]);
	extern void lxt971_no_sleep(void);

	/* fpga configuration data - gzip compressed and generated by bin2c */
	const unsigned char fpgadata[] =
	{
	#include "fpgadata.c"
	};

	/*
	* include common fpga code (for esd boards)
	*/
	#include "../common/fpga.c"

	/*
	* generate a short spike on the CAN tx line
	* to bring the couplers in sync
	*/
	void init_coupler(u32 addr)
	{
	struct sja1000_basic_s ctrl = (struct sja1000_basic_s )addr;

	/* reset */
	out_8(&ctrl->cr, CR_RR);

	/* dominant */
	out_8(&ctrl->btr0, 0x00); /* btr setup is required */
	out_8(&ctrl->btr1, 0x14); /* we use 1Mbit/s */
	out_8(&ctrl->oc, OC_TP1 \| OC_TN1 \| OC_POL1 \|
	OC_TP0 \| OC_TN0 \| OC_POL0 \| OC_MODE1);
	out_8(&ctrl->cr, 0x00);

	/* delay */
	in_8(&ctrl->cr);
	in_8(&ctrl->cr);
	in_8(&ctrl->cr);
	in_8(&ctrl->cr);

	/* reset */
	out_8(&ctrl->cr, CR_RR);
	}

	int board_early_init_f(void)
	{
	/*
	* IRQ 0-15 405GP internally generated; active high; level sensitive
	* IRQ 16 405GP internally generated; active low; level sensitive
	* IRQ 17-24 RESERVED
	* IRQ 25 (EXT IRQ 0) CAN0; active low; level sensitive
	* IRQ 26 (EXT IRQ 1) SER0 ; active low; level sensitive
	* IRQ 27 (EXT IRQ 2) SER1; active low; level sensitive
	* IRQ 28 (EXT IRQ 3) FPGA 0; active low; level sensitive
	* IRQ 29 (EXT IRQ 4) FPGA 1; active low; level sensitive
	* IRQ 30 (EXT IRQ 5) PCI INTA; active low; level sensitive
	* IRQ 31 (EXT IRQ 6) COMPACT FLASH; active high; level sensitive
	*/
	mtdcr(UIC0SR, 0xFFFFFFFF); /* clear all ints */
	mtdcr(UIC0ER, 0x00000000); /* disable all ints */
	mtdcr(UIC0CR, 0x00000000); /* set all to be non-critical*/
	mtdcr(UIC0PR, 0xFFFFFF99); /* set int polarities */
	mtdcr(UIC0TR, 0x10000000); /* set int trigger levels */
	mtdcr(UIC0VCR, 0x00000001); /* set vect base=0,INT0 highest prio */
	mtdcr(UIC0SR, 0xFFFFFFFF); /* clear all ints */

	/*
	* EBC Configuration Register: set ready timeout to
	* 512 ebc-clks -> ca. 15 us
	*/
	mtebc(EBC0_CFG, 0xa8400000); /* ebc always driven */

	return 0;
	}

	int misc_init_r(void)
	{
	unsigned char *dst;
	unsigned char fctr;
	ulong len = sizeof(fpgadata);
	int status;
	int index;
	int i;

	/* adjust flash start and offset */
	gd->bd->bi_flashstart = 0 - gd->bd->bi_flashsize;
	gd->bd->bi_flashoffset = 0;

	dst = malloc(CONFIG_SYS_FPGA_MAX_SIZE);
	if (gunzip(dst, CONFIG_SYS_FPGA_MAX_SIZE,
	(uchar *)fpgadata, &len) != 0) {
	printf("GUNZIP ERROR - must RESET board to recover\n");
	do_reset(NULL, 0, 0, NULL);
	}

	status = fpga_boot(dst, len);
	if (status != 0) {
	printf("\nFPGA: Booting failed ");
	switch (status) {
	case ERROR_FPGA_PRG_INIT_LOW:
	printf("(Timeout: INIT not low "
	"after asserting PROGRAM*)\n");
	break;
	case ERROR_FPGA_PRG_INIT_HIGH:
	printf("(Timeout: INIT not high "
	"after deasserting PROGRAM*)\n");
	break;
	case ERROR_FPGA_PRG_DONE:
	printf("(Timeout: DONE not high "
	"after programming FPGA)\n");
	break;
	}

	/* display infos on fpgaimage */
	index = 15;
	for (i=0; i<4; i++) {
	len = dst[index];
	printf("FPGA: %s\n", &(dst[index+1]));
	index += len+3;
	}
	putc ('\n');
	/* delayed reboot */
	for (i=20; i>0; i--) {
	printf("Rebooting in %2d seconds \r",i);
	for (index=0;index<1000;index++)
	udelay(1000);
	}
	putc('\n');
	do_reset(NULL, 0, 0, NULL);
	}

	puts("FPGA: ");

	/* display infos on fpgaimage */
	index = 15;
	for (i=0; i<4; i++) {
	len = dst[index];
	printf("%s ", &(dst[index+1]));
	index += len+3;
	}
	putc('\n');

	free(dst);

	/*
	* Reset FPGA via FPGA_DATA pin
	*/
	SET_FPGA(FPGA_PRG \| FPGA_CLK);
	udelay(1000); /* wait 1ms */
	SET_FPGA(FPGA_PRG \| FPGA_CLK \| FPGA_DATA);
	udelay(1000); /* wait 1ms */

	/*
	* Reset external DUARTs
	*/
	out_be32((void*)GPIO0_OR,
	in_be32((void*)GPIO0_OR) \| CONFIG_SYS_DUART_RST);
	udelay(10);
	out_be32((void*)GPIO0_OR,
	in_be32((void*)GPIO0_OR) & ~CONFIG_SYS_DUART_RST);
	udelay(1000);

	/*
	* Set NAND-FLASH GPIO signals to default
	*/
	out_be32((void*)GPIO0_OR,
	in_be32((void*)GPIO0_OR) &
	~(CONFIG_SYS_NAND_CLE \| CONFIG_SYS_NAND_ALE));
	out_be32((void*)GPIO0_OR,
	in_be32((void*)GPIO0_OR) \| CONFIG_SYS_NAND_CE);

	/*
	* Setup EEPROM write protection
	*/
	out_be32((void*)GPIO0_OR,
	in_be32((void*)GPIO0_OR) \| CONFIG_SYS_EEPROM_WP);
	out_be32((void*)GPIO0_TCR,
	in_be32((void*)GPIO0_TCR) \| CONFIG_SYS_EEPROM_WP);

	/*
	* Enable interrupts in exar duart mcr[3]
	*/
	out_8((void *)DUART0_BA + 4, 0x08);
	out_8((void *)DUART1_BA + 4, 0x08);

	/*
	* Enable auto RS485 mode in 2nd external uart
	*/
	out_8((void )DUART1_BA + 3, 0xbf); / write LCR */
	fctr = in_8((void )DUART1_BA + 1); / read FCTR */
	fctr \|= 0x08; /* enable RS485 mode */
	out_8((void )DUART1_BA + 1, fctr); / write FCTR */
	out_8((void )DUART1_BA + 3, 0); / write LCR */

	/*
	* Init magnetic couplers
	*/
	if (!getenv("noinitcoupler")) {
	init_coupler(CAN0_BA);
	init_coupler(CAN1_BA);
	}
	return 0;
	}

	/*
	* Check Board Identity:
	*/
	int checkboard(void)
	{
	char str[64];
	int i = getenv_r("serial#", str, sizeof(str));

	puts("Board: ");

	if (i == -1)
	puts("### No HW ID - assuming PLU405");
	else
	puts(str);

	putc('\n');
	return 0;
	}

	#ifdef CONFIG_IDE_RESET
	#define FPGA_CTRL (CONFIG_SYS_FPGA_BASE_ADDR + CONFIG_SYS_FPGA_CTRL)
	void ide_set_reset(int on)
	{
	/*
	* Assert or deassert CompactFlash Reset Pin
	*/
	if (on) { /* assert RESET */
	out_be16((void *)FPGA_CTRL,
	in_be16((void *)FPGA_CTRL) &
	~CONFIG_SYS_FPGA_CTRL_CF_RESET);
	} else { /* release RESET */
	out_be16((void *)FPGA_CTRL,
	in_be16((void *)FPGA_CTRL) \|
	CONFIG_SYS_FPGA_CTRL_CF_RESET);
	}
	}
	#endif /* CONFIG_IDE_RESET */

	void reset_phy(void)
	{
	#ifdef CONFIG_LXT971_NO_SLEEP

	/*
	* Disable sleep mode in LXT971
	*/
	lxt971_no_sleep();
	#endif
	}

	#if defined(CONFIG_SYS_EEPROM_WREN)
	/* Input: <dev_addr> I2C address of EEPROM device to enable.
	* <state> -1: deliver current state
	* 0: disable write
	* 1: enable write
	* Returns: -1: wrong device address
	* 0: dis-/en- able done
	* 0/1: current state if <state> was -1.
	*/
	int eeprom_write_enable(unsigned dev_addr, int state)
	{
	if (CONFIG_SYS_I2C_EEPROM_ADDR != dev_addr) {
	return -1;
	} else {
	switch (state) {
	case 1:
	/* Enable write access, clear bit GPIO0. */
	out_be32((void*)GPIO0_OR,
	in_be32((void*)GPIO0_OR) &
	~CONFIG_SYS_EEPROM_WP);
	state = 0;
	break;
	case 0:
	/* Disable write access, set bit GPIO0. */
	out_be32((void*)GPIO0_OR,
	in_be32((void*)GPIO0_OR) \|
	CONFIG_SYS_EEPROM_WP);
	state = 0;
	break;
	default:
	/* Read current status back. */
	state = ((in_be32((void*)GPIO0_OR) &
	CONFIG_SYS_EEPROM_WP) == 0);
	break;
	}
	}
	return state;
	}

	int do_eep_wren(cmd_tbl_t cmdtp, int flag, int argc, char argv[])
	{
	int query = argc == 1;
	int state = 0;

	if (query) {
	/* Query write access state. */
	state = eeprom_write_enable(CONFIG_SYS_I2C_EEPROM_ADDR, -1);
	if (state < 0) {
	puts("Query of write access state failed.\n");
	} else {
	printf("Write access for device 0x%0x is %sabled.\n",
	CONFIG_SYS_I2C_EEPROM_ADDR,
	state ? "en" : "dis");
	state = 0;
	}
	} else {
	if (argv[1][0] == '0') {
	/* Disable write access. */
	state = eeprom_write_enable(CONFIG_SYS_I2C_EEPROM_ADDR,
	0);
	} else {
	/* Enable write access. */
	state = eeprom_write_enable(CONFIG_SYS_I2C_EEPROM_ADDR,
	1);
	}
	if (state < 0)
	puts("Setup of write access state failed.\n");
	}

	return state;
	}

	U_BOOT_CMD(eepwren, 2, 0, do_eep_wren,
	"Enable / disable / query EEPROM write access",
	""
	);
	#endif /* #if defined(CONFIG_SYS_EEPROM_WREN) */