board/freescale/mpc8641hpcn/mpc8641hpcn.c - boot/u-boot-linaro-stable - Git at Google

 /*
  * Copyright 2006, 2007 Freescale Semiconductor.
  *
  * 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 <pci.h>
 #include <asm/processor.h>
 #include <asm/immap_86xx.h>
 #include <asm/immap_fsl_pci.h>
 #include <spd_sdram.h>
 #include <asm/io.h>
 #include <libfdt.h>
 #include <fdt_support.h>

 #include "../common/pixis.h"

 #if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
 extern void ddr_enable_ecc(unsigned int dram_size);
 #endif

 void sdram_init(void);
 long int fixed_sdram(void);


 int board_early_init_f(void)
 {
 	return 0;
 }

 int checkboard(void)
 {
 	puts("Board: MPC8641HPCN\n");

 	return 0;
 }


 long int
 initdram(int board_type)
 {
 	long dram_size = 0;

 #if defined(CONFIG_SPD_EEPROM)
 	dram_size = spd_sdram();
 #else
 	dram_size = fixed_sdram();
 #endif

 #if defined(CFG_RAMBOOT)
 	puts("    DDR: ");
 	return dram_size;
 #endif

 #if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
 	/*
 	 * Initialize and enable DDR ECC.
 	 */
 	ddr_enable_ecc(dram_size);
 #endif

 	puts("    DDR: ");
 	return dram_size;
 }


 #if !defined(CONFIG_SPD_EEPROM)
 /*
  * Fixed sdram init -- doesn't use serial presence detect.
  */
 long int
 fixed_sdram(void)
 {
 #if !defined(CFG_RAMBOOT)
 	volatile immap_t *immap = (immap_t *) CFG_IMMR;
 	volatile ccsr_ddr_t *ddr = &immap->im_ddr1;

 	ddr->cs0_bnds = CFG_DDR_CS0_BNDS;
 	ddr->cs0_config = CFG_DDR_CS0_CONFIG;
 	ddr->timing_cfg_3 = CFG_DDR_TIMING_3;
 	ddr->timing_cfg_0 = CFG_DDR_TIMING_0;
 	ddr->timing_cfg_1 = CFG_DDR_TIMING_1;
 	ddr->timing_cfg_2 = CFG_DDR_TIMING_2;
 	ddr->sdram_mode_1 = CFG_DDR_MODE_1;
 	ddr->sdram_mode_2 = CFG_DDR_MODE_2;
 	ddr->sdram_interval = CFG_DDR_INTERVAL;
 	ddr->sdram_data_init = CFG_DDR_DATA_INIT;
 	ddr->sdram_clk_cntl = CFG_DDR_CLK_CTRL;
 	ddr->sdram_ocd_cntl = CFG_DDR_OCD_CTRL;
 	ddr->sdram_ocd_status = CFG_DDR_OCD_STATUS;

 #if defined (CONFIG_DDR_ECC)
 	ddr->err_disable = 0x0000008D;
 	ddr->err_sbe = 0x00ff0000;
 #endif
 	asm("sync;isync");

 	udelay(500);

 #if defined (CONFIG_DDR_ECC)
 	/* Enable ECC checking */
 	ddr->sdram_cfg_1 = (CFG_DDR_CONTROL | 0x20000000);
 #else
 	ddr->sdram_cfg_1 = CFG_DDR_CONTROL;
 	ddr->sdram_cfg_2 = CFG_DDR_CONTROL2;
 #endif
 	asm("sync; isync");

 	udelay(500);
 #endif
 	return CFG_SDRAM_SIZE * 1024 * 1024;
 }
 #endif	/* !defined(CONFIG_SPD_EEPROM) */


 #if defined(CONFIG_PCI)
 /*
  * Initialize PCI Devices, report devices found.
  */

 #ifndef CONFIG_PCI_PNP
 static struct pci_config_table pci_fsl86xxads_config_table[] = {
 	{PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
 	 PCI_IDSEL_NUMBER, PCI_ANY_ID,
 	 pci_cfgfunc_config_device, {PCI_ENET0_IOADDR,
 				     PCI_ENET0_MEMADDR,
 				     PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER}},
 	{}
 };
 #endif


 static struct pci_controller pci1_hose = {
 #ifndef CONFIG_PCI_PNP
 	config_table:pci_mpc86xxcts_config_table
 #endif
 };
 #endif /* CONFIG_PCI */

 #ifdef CONFIG_PCI2
 static struct pci_controller pci2_hose;
 #endif	/* CONFIG_PCI2 */

 int first_free_busno = 0;


 void pci_init_board(void)
 {
 	volatile immap_t *immap = (immap_t *) CFG_CCSRBAR;
 	volatile ccsr_gur_t *gur = &immap->im_gur;
 	uint devdisr = gur->devdisr;
 	uint io_sel = (gur->pordevsr & MPC8641_PORDEVSR_IO_SEL)
 		>> MPC8641_PORDEVSR_IO_SEL_SHIFT;

 #ifdef CONFIG_PCI1
 {
 	volatile ccsr_fsl_pci_t *pci = (ccsr_fsl_pci_t *) CFG_PCI1_ADDR;
 	extern void fsl_pci_init(struct pci_controller *hose);
 	struct pci_controller *hose = &pci1_hose;
 #ifdef DEBUG
 	uint host1_agent = (gur->porbmsr & MPC8641_PORBMSR_HA)
 		>> MPC8641_PORBMSR_HA_SHIFT;
 	uint pex1_agent = (host1_agent == 0) || (host1_agent == 1);
 #endif
 	if ((io_sel == 2 || io_sel == 3 || io_sel == 5
 	     || io_sel == 6 || io_sel == 7 || io_sel == 0xF)
 	    && !(devdisr & MPC86xx_DEVDISR_PCIEX1)) {
 		debug("PCI-EXPRESS 1: %s \n", pex1_agent ? "Agent" : "Host");
 		debug("0x%08x=0x%08x ", &pci->pme_msg_det, pci->pme_msg_det);
 		if (pci->pme_msg_det) {
 			pci->pme_msg_det = 0xffffffff;
 			debug(" with errors.  Clearing.  Now 0x%08x",
 			      pci->pme_msg_det);
 		}
 		debug("\n");

 		/* inbound */
 		pci_set_region(hose->regions + 0,
 			       CFG_PCI_MEMORY_BUS,
 			       CFG_PCI_MEMORY_PHYS,
 			       CFG_PCI_MEMORY_SIZE,
 			       PCI_REGION_MEM | PCI_REGION_MEMORY);

 		/* outbound memory */
 		pci_set_region(hose->regions + 1,
 			       CFG_PCI1_MEM_BASE,
 			       CFG_PCI1_MEM_PHYS,
 			       CFG_PCI1_MEM_SIZE,
 			       PCI_REGION_MEM);

 		/* outbound io */
 		pci_set_region(hose->regions + 2,
 			       CFG_PCI1_IO_BASE,
 			       CFG_PCI1_IO_PHYS,
 			       CFG_PCI1_IO_SIZE,
 			       PCI_REGION_IO);

 		hose->region_count = 3;

 		hose->first_busno=first_free_busno;
 		pci_setup_indirect(hose, (int) &pci->cfg_addr, (int) &pci->cfg_data);

 		fsl_pci_init(hose);

 		first_free_busno=hose->last_busno+1;
 		printf ("    PCI-EXPRESS 1 on bus %02x - %02x\n",
 			hose->first_busno,hose->last_busno);

 		/*
 		 * Activate ULI1575 legacy chip by performing a fake
 		 * memory access.  Needed to make ULI RTC work.
 		 */
 		in_be32((unsigned *) ((char *)(CFG_PCI1_MEM_BASE
 				       + CFG_PCI1_MEM_SIZE - 0x1000000)));

 	} else {
 		puts("PCI-EXPRESS 1: Disabled\n");
 	}
 }
 #else
 	puts("PCI-EXPRESS1: Disabled\n");
 #endif /* CONFIG_PCI1 */

 #ifdef CONFIG_PCI2
 {
 	volatile ccsr_fsl_pci_t *pci = (ccsr_fsl_pci_t *) CFG_PCI2_ADDR;
 	extern void fsl_pci_init(struct pci_controller *hose);
 	struct pci_controller *hose = &pci2_hose;


 	/* inbound */
 	pci_set_region(hose->regions + 0,
 		       CFG_PCI_MEMORY_BUS,
 		       CFG_PCI_MEMORY_PHYS,
 		       CFG_PCI_MEMORY_SIZE,
 		       PCI_REGION_MEM | PCI_REGION_MEMORY);

 	/* outbound memory */
 	pci_set_region(hose->regions + 1,
 		       CFG_PCI2_MEM_BASE,
 		       CFG_PCI2_MEM_PHYS,
 		       CFG_PCI2_MEM_SIZE,
 		       PCI_REGION_MEM);

 	/* outbound io */
 	pci_set_region(hose->regions + 2,
 		       CFG_PCI2_IO_BASE,
 		       CFG_PCI2_IO_PHYS,
 		       CFG_PCI2_IO_SIZE,
 		       PCI_REGION_IO);

 	hose->region_count = 3;

 	hose->first_busno=first_free_busno;
 	pci_setup_indirect(hose, (int) &pci->cfg_addr, (int) &pci->cfg_data);

 	fsl_pci_init(hose);

 	first_free_busno=hose->last_busno+1;
 	printf ("    PCI-EXPRESS 2 on bus %02x - %02x\n",
 		hose->first_busno,hose->last_busno);
 }
 #else
 	puts("PCI-EXPRESS 2: Disabled\n");
 #endif /* CONFIG_PCI2 */

 }


 #if defined(CONFIG_OF_BOARD_SETUP)

 void
 ft_board_setup(void *blob, bd_t *bd)
 {
 	int node, tmp[2];
 	const char *path;

 	ft_cpu_setup(blob, bd);

 	node = fdt_path_offset(blob, "/aliases");
 	tmp[0] = 0;
 	if (node >= 0) {
 #ifdef CONFIG_PCI1
 		path = fdt_getprop(blob, node, "pci0", NULL);
 		if (path) {
 			tmp[1] = pci1_hose.last_busno - pci1_hose.first_busno;
 			do_fixup_by_path(blob, path, "bus-range", &tmp, 8, 1);
 		}
 #endif
 #ifdef CONFIG_PCI2
 		path = fdt_getprop(blob, node, "pci1", NULL);
 		if (path) {
 			tmp[1] = pci2_hose.last_busno - pci2_hose.first_busno;
 			do_fixup_by_path(blob, path, "bus-range", &tmp, 8, 1);
 		}
 #endif
 	}
 }
 #endif


 /*
  * get_board_sys_clk
  *      Reads the FPGA on board for CONFIG_SYS_CLK_FREQ
  */

 unsigned long
 get_board_sys_clk(ulong dummy)
 {
 	u8 i, go_bit, rd_clks;
 	ulong val = 0;

 	go_bit = in8(PIXIS_BASE + PIXIS_VCTL);
 	go_bit &= 0x01;

 	rd_clks = in8(PIXIS_BASE + PIXIS_VCFGEN0);
 	rd_clks &= 0x1C;

 	/*
 	 * Only if both go bit and the SCLK bit in VCFGEN0 are set
 	 * should we be using the AUX register. Remember, we also set the
 	 * GO bit to boot from the alternate bank on the on-board flash
 	 */

 	if (go_bit) {
 		if (rd_clks == 0x1c)
 			i = in8(PIXIS_BASE + PIXIS_AUX);
 		else
 			i = in8(PIXIS_BASE + PIXIS_SPD);
 	} else {
 		i = in8(PIXIS_BASE + PIXIS_SPD);
 	}

 	i &= 0x07;

 	switch (i) {
 	case 0:
 		val = 33000000;
 		break;
 	case 1:
 		val = 40000000;
 		break;
 	case 2:
 		val = 50000000;
 		break;
 	case 3:
 		val = 66000000;
 		break;
 	case 4:
 		val = 83000000;
 		break;
 	case 5:
 		val = 100000000;
 		break;
 	case 6:
 		val = 134000000;
 		break;
 	case 7:
 		val = 166000000;
 		break;
 	}

 	return val;
 }
	/*
	* Copyright 2006, 2007 Freescale Semiconductor.
	*
	* 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 <pci.h>
	#include <asm/processor.h>
	#include <asm/immap_86xx.h>
	#include <asm/immap_fsl_pci.h>
	#include <spd_sdram.h>
	#include <asm/io.h>
	#include <libfdt.h>
	#include <fdt_support.h>

	#include "../common/pixis.h"

	#if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
	extern void ddr_enable_ecc(unsigned int dram_size);
	#endif

	void sdram_init(void);
	long int fixed_sdram(void);


	int board_early_init_f(void)
	{
	return 0;
	}

	int checkboard(void)
	{
	puts("Board: MPC8641HPCN\n");

	return 0;
	}


	long int
	initdram(int board_type)
	{
	long dram_size = 0;

	#if defined(CONFIG_SPD_EEPROM)
	dram_size = spd_sdram();
	#else
	dram_size = fixed_sdram();
	#endif

	#if defined(CFG_RAMBOOT)
	puts(" DDR: ");
	return dram_size;
	#endif

	#if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER)
	/*
	* Initialize and enable DDR ECC.
	*/
	ddr_enable_ecc(dram_size);
	#endif

	puts(" DDR: ");
	return dram_size;
	}


	#if !defined(CONFIG_SPD_EEPROM)
	/*
	* Fixed sdram init -- doesn't use serial presence detect.
	*/
	long int
	fixed_sdram(void)
	{
	#if !defined(CFG_RAMBOOT)
	volatile immap_t immap = (immap_t ) CFG_IMMR;
	volatile ccsr_ddr_t *ddr = &immap->im_ddr1;

	ddr->cs0_bnds = CFG_DDR_CS0_BNDS;
	ddr->cs0_config = CFG_DDR_CS0_CONFIG;
	ddr->timing_cfg_3 = CFG_DDR_TIMING_3;
	ddr->timing_cfg_0 = CFG_DDR_TIMING_0;
	ddr->timing_cfg_1 = CFG_DDR_TIMING_1;
	ddr->timing_cfg_2 = CFG_DDR_TIMING_2;
	ddr->sdram_mode_1 = CFG_DDR_MODE_1;
	ddr->sdram_mode_2 = CFG_DDR_MODE_2;
	ddr->sdram_interval = CFG_DDR_INTERVAL;
	ddr->sdram_data_init = CFG_DDR_DATA_INIT;
	ddr->sdram_clk_cntl = CFG_DDR_CLK_CTRL;
	ddr->sdram_ocd_cntl = CFG_DDR_OCD_CTRL;
	ddr->sdram_ocd_status = CFG_DDR_OCD_STATUS;

	#if defined (CONFIG_DDR_ECC)
	ddr->err_disable = 0x0000008D;
	ddr->err_sbe = 0x00ff0000;
	#endif
	asm("sync;isync");

	udelay(500);

	#if defined (CONFIG_DDR_ECC)
	/* Enable ECC checking */
	ddr->sdram_cfg_1 = (CFG_DDR_CONTROL \| 0x20000000);
	#else
	ddr->sdram_cfg_1 = CFG_DDR_CONTROL;
	ddr->sdram_cfg_2 = CFG_DDR_CONTROL2;
	#endif
	asm("sync; isync");

	udelay(500);
	#endif
	return CFG_SDRAM_SIZE * 1024 * 1024;
	}
	#endif /* !defined(CONFIG_SPD_EEPROM) */


	#if defined(CONFIG_PCI)
	/*
	* Initialize PCI Devices, report devices found.
	*/

	#ifndef CONFIG_PCI_PNP
	static struct pci_config_table pci_fsl86xxads_config_table[] = {
	{PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
	PCI_IDSEL_NUMBER, PCI_ANY_ID,
	pci_cfgfunc_config_device, {PCI_ENET0_IOADDR,
	PCI_ENET0_MEMADDR,
	PCI_COMMAND_MEMORY \| PCI_COMMAND_MASTER}},
	{}
	};
	#endif


	static struct pci_controller pci1_hose = {
	#ifndef CONFIG_PCI_PNP
	config_table:pci_mpc86xxcts_config_table
	#endif
	};
	#endif /* CONFIG_PCI */

	#ifdef CONFIG_PCI2
	static struct pci_controller pci2_hose;
	#endif /* CONFIG_PCI2 */

	int first_free_busno = 0;


	void pci_init_board(void)
	{
	volatile immap_t immap = (immap_t ) CFG_CCSRBAR;
	volatile ccsr_gur_t *gur = &immap->im_gur;
	uint devdisr = gur->devdisr;
	uint io_sel = (gur->pordevsr & MPC8641_PORDEVSR_IO_SEL)
	>> MPC8641_PORDEVSR_IO_SEL_SHIFT;

	#ifdef CONFIG_PCI1
	{
	volatile ccsr_fsl_pci_t pci = (ccsr_fsl_pci_t ) CFG_PCI1_ADDR;
	extern void fsl_pci_init(struct pci_controller *hose);
	struct pci_controller *hose = &pci1_hose;
	#ifdef DEBUG
	uint host1_agent = (gur->porbmsr & MPC8641_PORBMSR_HA)
	>> MPC8641_PORBMSR_HA_SHIFT;
	uint pex1_agent = (host1_agent == 0) \|\| (host1_agent == 1);
	#endif
	if ((io_sel == 2 \|\| io_sel == 3 \|\| io_sel == 5
	\|\| io_sel == 6 \|\| io_sel == 7 \|\| io_sel == 0xF)
	&& !(devdisr & MPC86xx_DEVDISR_PCIEX1)) {
	debug("PCI-EXPRESS 1: %s \n", pex1_agent ? "Agent" : "Host");
	debug("0x%08x=0x%08x ", &pci->pme_msg_det, pci->pme_msg_det);
	if (pci->pme_msg_det) {
	pci->pme_msg_det = 0xffffffff;
	debug(" with errors. Clearing. Now 0x%08x",
	pci->pme_msg_det);
	}
	debug("\n");

	/* inbound */
	pci_set_region(hose->regions + 0,
	CFG_PCI_MEMORY_BUS,
	CFG_PCI_MEMORY_PHYS,
	CFG_PCI_MEMORY_SIZE,
	PCI_REGION_MEM \| PCI_REGION_MEMORY);

	/* outbound memory */
	pci_set_region(hose->regions + 1,
	CFG_PCI1_MEM_BASE,
	CFG_PCI1_MEM_PHYS,
	CFG_PCI1_MEM_SIZE,
	PCI_REGION_MEM);

	/* outbound io */
	pci_set_region(hose->regions + 2,
	CFG_PCI1_IO_BASE,
	CFG_PCI1_IO_PHYS,
	CFG_PCI1_IO_SIZE,
	PCI_REGION_IO);

	hose->region_count = 3;

	hose->first_busno=first_free_busno;
	pci_setup_indirect(hose, (int) &pci->cfg_addr, (int) &pci->cfg_data);

	fsl_pci_init(hose);

	first_free_busno=hose->last_busno+1;
	printf (" PCI-EXPRESS 1 on bus %02x - %02x\n",
	hose->first_busno,hose->last_busno);

	/*
	* Activate ULI1575 legacy chip by performing a fake
	* memory access. Needed to make ULI RTC work.
	*/
	in_be32((unsigned ) ((char )(CFG_PCI1_MEM_BASE
	+ CFG_PCI1_MEM_SIZE - 0x1000000)));

	} else {
	puts("PCI-EXPRESS 1: Disabled\n");
	}
	}
	#else
	puts("PCI-EXPRESS1: Disabled\n");
	#endif /* CONFIG_PCI1 */

	#ifdef CONFIG_PCI2
	{
	volatile ccsr_fsl_pci_t pci = (ccsr_fsl_pci_t ) CFG_PCI2_ADDR;
	extern void fsl_pci_init(struct pci_controller *hose);
	struct pci_controller *hose = &pci2_hose;


	/* inbound */
	pci_set_region(hose->regions + 0,
	CFG_PCI_MEMORY_BUS,
	CFG_PCI_MEMORY_PHYS,
	CFG_PCI_MEMORY_SIZE,
	PCI_REGION_MEM \| PCI_REGION_MEMORY);

	/* outbound memory */
	pci_set_region(hose->regions + 1,
	CFG_PCI2_MEM_BASE,
	CFG_PCI2_MEM_PHYS,
	CFG_PCI2_MEM_SIZE,
	PCI_REGION_MEM);

	/* outbound io */
	pci_set_region(hose->regions + 2,
	CFG_PCI2_IO_BASE,
	CFG_PCI2_IO_PHYS,
	CFG_PCI2_IO_SIZE,
	PCI_REGION_IO);

	hose->region_count = 3;

	hose->first_busno=first_free_busno;
	pci_setup_indirect(hose, (int) &pci->cfg_addr, (int) &pci->cfg_data);

	fsl_pci_init(hose);

	first_free_busno=hose->last_busno+1;
	printf (" PCI-EXPRESS 2 on bus %02x - %02x\n",
	hose->first_busno,hose->last_busno);
	}
	#else
	puts("PCI-EXPRESS 2: Disabled\n");
	#endif /* CONFIG_PCI2 */

	}


	#if defined(CONFIG_OF_BOARD_SETUP)

	void
	ft_board_setup(void blob, bd_t bd)
	{
	int node, tmp[2];
	const char *path;

	ft_cpu_setup(blob, bd);

	node = fdt_path_offset(blob, "/aliases");
	tmp[0] = 0;
	if (node >= 0) {
	#ifdef CONFIG_PCI1
	path = fdt_getprop(blob, node, "pci0", NULL);
	if (path) {
	tmp[1] = pci1_hose.last_busno - pci1_hose.first_busno;
	do_fixup_by_path(blob, path, "bus-range", &tmp, 8, 1);
	}
	#endif
	#ifdef CONFIG_PCI2
	path = fdt_getprop(blob, node, "pci1", NULL);
	if (path) {
	tmp[1] = pci2_hose.last_busno - pci2_hose.first_busno;
	do_fixup_by_path(blob, path, "bus-range", &tmp, 8, 1);
	}
	#endif
	}
	}
	#endif


	/*
	* get_board_sys_clk
	* Reads the FPGA on board for CONFIG_SYS_CLK_FREQ
	*/

	unsigned long
	get_board_sys_clk(ulong dummy)
	{
	u8 i, go_bit, rd_clks;
	ulong val = 0;

	go_bit = in8(PIXIS_BASE + PIXIS_VCTL);
	go_bit &= 0x01;

	rd_clks = in8(PIXIS_BASE + PIXIS_VCFGEN0);
	rd_clks &= 0x1C;

	/*
	* Only if both go bit and the SCLK bit in VCFGEN0 are set
	* should we be using the AUX register. Remember, we also set the
	* GO bit to boot from the alternate bank on the on-board flash
	*/

	if (go_bit) {
	if (rd_clks == 0x1c)
	i = in8(PIXIS_BASE + PIXIS_AUX);
	else
	i = in8(PIXIS_BASE + PIXIS_SPD);
	} else {
	i = in8(PIXIS_BASE + PIXIS_SPD);
	}

	i &= 0x07;

	switch (i) {
	case 0:
	val = 33000000;
	break;
	case 1:
	val = 40000000;
	break;
	case 2:
	val = 50000000;
	break;
	case 3:
	val = 66000000;
	break;
	case 4:
	val = 83000000;
	break;
	case 5:
	val = 100000000;
	break;
	case 6:
	val = 134000000;
	break;
	case 7:
	val = 166000000;
	break;
	}

	return val;
	}