* Patch by Daniel Engström, 13 Nov 2002:LABEL_2002_11_18_0115

  Add support for i386 architecture and AMD SC520 board

* Patch by Pierre Aubert, 12 Nov 2002:
  Add support for DOS filesystem and booting from DOS floppy disk

1 files changed, 448 insertions, 0 deletions

diff --git a/lib_i386/board.c b/lib_i386/board.c
new file mode 100644
index 00000000000..193860a87a4
--- /dev/null
+++ b/lib_i386/board.c
@@ -0,0 +1,448 @@
+/*
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, daniel@omicron.se
+ * 
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ * 
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.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 <common.h>
+#include <watchdog.h>
+#include <command.h>
+#include <devices.h>
+#include <version.h>
+#include <malloc.h>
+#include <syscall.h>
+#include <net.h>
+#include <ide.h>
+
+extern long _i386boot_start;	    
+extern long _i386boot_end;	    
+extern long _i386boot_romdata_start;
+extern long _i386boot_romdata_dest; 
+extern long _i386boot_romdata_size; 
+extern long _i386boot_bss_start;   
+extern long _i386boot_bss_size;    
+
+extern long _i386boot_realmode;    
+extern long _i386boot_realmode_size;
+extern long _i386boot_bios;         
+extern long _i386boot_bios_size;    
+
+/* The symbols defined by the linker script becomes pointers
+ * which is somewhat inconveient ... */
+ulong i386boot_start         = (ulong)&_i386boot_start;         /* code start (in flash) defined in start.S */
+ulong i386boot_end           = (ulong)&_i386boot_end;	        /* code end (in flash) */
+ulong i386boot_romdata_start = (ulong)&_i386boot_romdata_start; /* datasegment in flash (also code+rodata end) */
+ulong i386boot_romdata_dest  = (ulong)&_i386boot_romdata_dest;  /* data location segment in ram */
+ulong i386boot_romdata_size  = (ulong)&_i386boot_romdata_size;  /* size of data segment */
+ulong i386boot_bss_start     = (ulong)&_i386boot_bss_start;     /* bss start */
+ulong i386boot_bss_size      = (ulong)&_i386boot_bss_size;      /* bss size */
+
+ulong i386boot_realmode      = (ulong)&_i386boot_realmode;      /* start of realmode entry code */
+ulong i386boot_realmode_size = (ulong)&_i386boot_realmode_size; /* size of realmode entry code */
+ulong i386boot_bios          = (ulong)&_i386boot_bios;          /* start of BIOS emulation code */
+ulong i386boot_bios_size     = (ulong)&_i386boot_bios_size;     /* size of BIOS emulation code */
+
+
+const char version_string[] =
+	U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
+
+
+/*
+ * Begin and End of memory area for malloc(), and current "brk"
+ */
+static ulong mem_malloc_start = 0;
+static ulong mem_malloc_end = 0;
+static ulong mem_malloc_brk = 0;
+
+static int mem_malloc_init(void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+        
+#if 1	
+	/* start malloc area right after the stack */
+	mem_malloc_start = i386boot_bss_start + 
+		i386boot_bss_size + CFG_STACK_SIZE;
+	mem_malloc_start = (mem_malloc_start+3)&~3;
+#else
+	mem_malloc_start = 0x400000;
+#endif	
+#if 1
+	/* Use all available RAM for malloc() */
+	mem_malloc_end = gd->ram_size;
+#else	
+	/* Use only  CONFIG_MALLOC_SIZE bytes of RAM for malloc() */
+	mem_malloc_end = mem_malloc_start + CONFIG_MALLOC_SIZE;
+#endif	
+	mem_malloc_brk = mem_malloc_start;
+
+	return 0;
+}
+
+void *sbrk (ptrdiff_t increment)
+{
+	ulong old = mem_malloc_brk;
+	ulong new = old + increment;
+
+	if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
+		return (NULL);
+	}
+	mem_malloc_brk = new;
+
+	return ((void *) old);
+}
+
+char *strmhz (char *buf, long hz)
+{
+	long l, n;
+	long m;
+
+	n = hz / 1000000L;
+	l = sprintf (buf, "%ld", n);
+	m = (hz % 1000000L) / 1000L;
+	if (m != 0)
+		sprintf (buf + l, ".%03ld", m);
+	return (buf);
+}
+
+/************************************************************************
+ * Init Utilities							*
+ ************************************************************************
+ * Some of this code should be moved into the core functions,
+ * or dropped completely,
+ * but let's get it working (again) first...
+ */
+static void syscalls_init (void)
+{
+	syscall_tbl[SYSCALL_MALLOC] = (void *) malloc;
+	syscall_tbl[SYSCALL_FREE] = (void *) free;
+
+	syscall_tbl[SYSCALL_INSTALL_HDLR] = (void *) irq_install_handler;
+	syscall_tbl[SYSCALL_FREE_HDLR] = (void *) irq_free_handler;
+
+}
+
+static int init_baudrate (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	uchar tmp[64];	/* long enough for environment variables */
+	int i = getenv_r ("baudrate", tmp, sizeof (tmp));
+
+	gd->baudrate = (i > 0)
+			? (int) simple_strtoul (tmp, NULL, 10)
+			: CONFIG_BAUDRATE;
+
+	return (0);
+}
+
+static int display_banner (void)
+{
+
+	printf ("\n\n%s\n\n", version_string);
+	printf ("U-Boot code: %08lX -> %08lX  data: %08lX -> %08lX\n"
+		"        BSS: %08lX -> %08lX stack: %08lX -> %08lX\n",
+		i386boot_start, i386boot_romdata_start-1,
+		i386boot_romdata_dest, i386boot_romdata_dest+i386boot_romdata_size-1,
+		i386boot_bss_start, i386boot_bss_start+i386boot_bss_size-1,
+		i386boot_bss_start+i386boot_bss_size, 
+		i386boot_bss_start+i386boot_bss_size+CFG_STACK_SIZE-1);
+	
+
+	return (0);
+}
+
+/*
+ * WARNING: this code looks "cleaner" than the PowerPC version, but
+ * has the disadvantage that you either get nothing, or everything.
+ * On PowerPC, you might see "DRAM: " before the system hangs - which
+ * gives a simple yet clear indication which part of the
+ * initialization if failing.
+ */
+static int display_dram_config (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	int i;
+
+	puts ("DRAM Configuration:\n");
+
+	for (i=0; i<CONFIG_NR_DRAM_BANKS; i++) {
+		printf ("Bank #%d: %08lx ", i, gd->bd->bi_dram[i].start);
+		print_size (gd->bd->bi_dram[i].size, "\n");
+	}
+	
+	return (0);
+}
+
+static void display_flash_config (ulong size)
+{
+	puts ("Flash: ");
+	print_size (size, "\n");
+}
+
+
+
+/*
+ * Breath some life into the board...
+ *
+ * Initialize an SMC for serial comms, and carry out some hardware
+ * tests.
+ *
+ * The first part of initialization is running from Flash memory;
+ * its main purpose is to initialize the RAM so that we
+ * can relocate the monitor code to RAM.
+ */
+
+/*
+ * All attempts to come up with a "common" initialization sequence
+ * that works for all boards and architectures failed: some of the
+ * requirements are just _too_ different. To get rid of the resulting
+ * mess of board dependend #ifdef'ed code we now make the whole
+ * initialization sequence configurable to the user.
+ *
+ * The requirements for any new initalization function is simple: it
+ * receives a pointer to the "global data" structure as it's only
+ * argument, and returns an integer return code, where 0 means
+ * "continue" and != 0 means "fatal error, hang the system".
+ */
+typedef int (init_fnc_t) (void);
+
+init_fnc_t *init_sequence[] = {
+	cpu_init,		/* basic cpu dependent setup */
+	board_init,		/* basic board dependent setup */
+	dram_init,		/* configure available RAM banks */
+	mem_malloc_init,        /* dependant on dram_init */
+	interrupt_init,		/* set up exceptions */
+	timer_init,	
+	env_init,		/* initialize environment */
+	init_baudrate,		/* initialze baudrate settings */
+	serial_init,		/* serial communications setup */
+	display_banner,
+	display_dram_config,
+
+	NULL,
+};
+
+gd_t *global_data;
+
+void start_i386boot (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	char *s;
+	int i;
+	ulong size;
+	static gd_t gd_data;
+	static bd_t bd_data;
+	init_fnc_t **init_fnc_ptr;
+	
+	show_boot_progress(0x21);
+
+	gd = global_data = &gd_data;
+	
+	memset (gd, 0, sizeof (gd_t));
+	gd->bd = &bd_data;
+	memset (gd->bd, 0, sizeof (bd_t));
+	show_boot_progress(0x22);
+
+	
+	for (init_fnc_ptr = init_sequence, i=0; *init_fnc_ptr; ++init_fnc_ptr, i++) {
+		show_boot_progress(0xa130|i);
+
+		if ((*init_fnc_ptr)() != 0) {
+			hang ();
+		}
+	}
+	show_boot_progress(0x23);
+
+	/* configure available FLASH banks */
+	size = flash_init();
+	display_flash_config(size);
+	show_boot_progress(0x24);
+
+	show_boot_progress(0x25);
+
+	/* initialize environment */
+	env_relocate ();
+	show_boot_progress(0x26);
+
+
+	/* IP Address */
+	bd_data.bi_ip_addr = getenv_IPaddr ("ipaddr");
+
+	/* MAC Address */
+	{
+		int i;
+		ulong reg;
+		char *s, *e;
+		uchar tmp[64];
+
+		i = getenv_r ("ethaddr", tmp, sizeof (tmp));
+		s = (i > 0) ? tmp : NULL;
+
+		for (reg = 0; reg < 6; ++reg) {
+			bd_data.bi_enetaddr[reg] = s ? simple_strtoul (s, &e, 16) : 0;
+			if (s)
+				s = (*e) ? e + 1 : e;
+		}
+	}
+
+#if defined(CONFIG_PCI)
+	/*
+	 * Do pci configuration
+	 */
+	pci_init();
+#endif
+
+	show_boot_progress(0x27);
+
+
+	devices_init ();
+
+	/* allocate syscalls table (console_init_r will fill it in */
+	syscall_tbl = (void **) malloc (NR_SYSCALLS * sizeof (void *));
+
+	/* Initialize the console (after the relocation and devices init) */
+	console_init_r();
+	syscalls_init();
+
+#ifdef CONFIG_MISC_INIT_R
+	/* miscellaneous platform dependent initialisations */
+	misc_init_r();
+#endif
+
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET) && (0)
+	WATCHDOG_RESET();
+# ifdef DEBUG
+	puts ("Reset Ethernet PHY\n");
+# endif
+	reset_phy();
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_PCMCIA) && !(CONFIG_COMMANDS & CFG_CMD_IDE)
+	WATCHDOG_RESET();
+	puts ("PCMCIA:");
+	pcmcia_init();
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_KGDB)
+	WATCHDOG_RESET();
+	puts("KGDB:  ");
+	kgdb_init();
+#endif
+
+	/* enable exceptions */
+	enable_interrupts ();
+	show_boot_progress(0x28);
+
+	/* Must happen after interrupts are initialized since
+	 * an irq handler gets installed
+	 */
+#ifdef CONFIG_SERIAL_SOFTWARE_FIFO
+	serial_buffered_init();
+#endif
+    
+#ifdef CONFIG_STATUS_LED
+	status_led_set (STATUS_LED_BOOT, STATUS_LED_BLINKING);
+#endif
+
+	udelay (20);
+
+	set_timer (0);
+
+	/* Initialize from environment */
+	if ((s = getenv ("loadaddr")) != NULL) {
+		load_addr = simple_strtoul (s, NULL, 16);
+	}
+#if (CONFIG_COMMANDS & CFG_CMD_NET)
+	if ((s = getenv ("bootfile")) != NULL) {
+		copy_filename (BootFile, s, sizeof (BootFile));
+	}
+#endif /* CFG_CMD_NET */
+
+	WATCHDOG_RESET();
+
+#if (CONFIG_COMMANDS & CFG_CMD_IDE)
+	WATCHDOG_RESET();
+	puts("IDE:   ");
+	ide_init();
+#endif /* CFG_CMD_IDE */
+
+#if (CONFIG_COMMANDS & CFG_CMD_SCSI)
+	WATCHDOG_RESET();
+	puts("SCSI:  ");
+	scsi_init();
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_DOC)
+	WATCHDOG_RESET();
+	puts ("DOC:   ");
+	doc_init();
+#endif
+
+#if (CONFIG_COMMANDS & CFG_CMD_NET) && defined(CONFIG_NET_MULTI)
+	WATCHDOG_RESET();
+	puts("Net:   ");
+	eth_initialize(gd->bd);
+#endif
+
+#ifdef CONFIG_LAST_STAGE_INIT
+	WATCHDOG_RESET();
+	/*
+	 * Some parts can be only initialized if all others (like
+	 * Interrupts) are up and running (i.e. the PC-style ISA
+	 * keyboard).
+	 */
+	last_stage_init();
+#endif
+
+
+
+#ifdef CONFIG_POST
+	post_run (NULL, POST_RAM | post_bootmode_get(0));
+	if (post_bootmode_get(0) & POST_POWERFAIL) {
+		post_bootmode_clear();
+		board_poweroff();
+	}
+#endif
+
+	show_boot_progress(0x29);
+	
+	/* main_loop() can return to retry autoboot, if so just run it again. */
+	for (;;) {
+		main_loop ();
+	}
+
+	/* NOTREACHED - no way out of command loop except booting */
+}
+
+void hang (void)
+{
+	puts ("### ERROR ### Please RESET the board ###\n");
+	for (;;);
+}
+
+