* Patch by Daniel Engström, 13 Nov 2002:

  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, 174 insertions, 0 deletions

diff --git a/lib_i386/i386_linux.c b/lib_i386/i386_linux.c
new file mode 100644
index 0000000..c37a0d8
--- /dev/null
+++ b/lib_i386/i386_linux.c
@@ -0,0 +1,174 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * Copyright (C) 2001  Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
+ *
+ * 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 <command.h>
+#include <cmd_boot.h>
+#include <image.h>
+#include <zlib.h>
+#include <asm/byteorder.h>
+#include <asm/zimage.h>
+
+
+extern image_header_t header;           /* from cmd_bootm.c */
+
+
+image_header_t *fake_header(image_header_t *hdr, void *ptr, int size)
+{
+	/* try each supported image type in order */
+	if (NULL != fake_zimage_header(hdr, ptr, size)) {
+		return hdr;
+	}
+	
+	return NULL;
+}
+
+
+void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
+		ulong addr, ulong *len_ptr, int   verify)
+{
+	ulong base_ptr;
+	
+	ulong len = 0, checksum;
+	ulong initrd_start, initrd_end;
+	ulong data;
+	image_header_t *hdr = &header;
+	
+	/*
+	 * Check if there is an initrd image
+	 */
+	if (argc >= 3) {
+		addr = simple_strtoul(argv[2], NULL, 16);
+		
+		printf ("## Loading Ramdisk Image at %08lx ...\n", addr);
+		
+		/* Copy header so we can blank CRC field for re-calculation */
+		memcpy (&header, (char *)addr, sizeof(image_header_t));
+		
+		if (ntohl(hdr->ih_magic) != IH_MAGIC) {
+			printf ("Bad Magic Number\n");
+			do_reset (cmdtp, flag, argc, argv);
+		}
+		
+		data = (ulong)&header;
+		len  = sizeof(image_header_t);
+		
+		checksum = ntohl(hdr->ih_hcrc);
+		hdr->ih_hcrc = 0;
+		
+		if (crc32 (0, (char *)data, len) != checksum) {
+			printf ("Bad Header Checksum\n");
+			do_reset (cmdtp, flag, argc, argv);
+		}
+		
+		print_image_hdr (hdr);
+		
+		data = addr + sizeof(image_header_t);
+		len  = ntohl(hdr->ih_size);
+		
+		if (verify) {
+			ulong csum = 0;
+			
+			printf ("   Verifying Checksum ... ");
+			csum = crc32 (0, (char *)data, len);
+			if (csum != ntohl(hdr->ih_dcrc)) {
+				printf ("Bad Data CRC\n");
+				do_reset (cmdtp, flag, argc, argv);
+			}
+			printf ("OK\n");
+		}
+		
+		if ((hdr->ih_os   != IH_OS_LINUX)	||
+		    (hdr->ih_arch != IH_CPU_I386)	||
+		    (hdr->ih_type != IH_TYPE_RAMDISK)	) {
+			printf ("No Linux i386 Ramdisk Image\n");
+			do_reset (cmdtp, flag, argc, argv);
+		}
+		
+		/*
+		 * Now check if we have a multifile image
+		 */
+	} else if ((hdr->ih_type==IH_TYPE_MULTI) && (len_ptr[1])) {
+		ulong tail    = ntohl(len_ptr[0]) % 4;
+		int i;
+		
+		/* skip kernel length and terminator */
+		data = (ulong)(&len_ptr[2]);
+		/* skip any additional image length fields */
+		for (i=1; len_ptr[i]; ++i)
+			data += 4;
+		/* add kernel length, and align */
+		data += ntohl(len_ptr[0]);
+		if (tail) {
+			data += 4 - tail;
+		}
+		
+		len   = ntohl(len_ptr[1]);
+		
+	} else {
+		/*
+		 * no initrd image
+		 */
+		data = 0;
+	}
+	
+#ifdef	DEBUG
+	if (!data) {
+		printf ("No initrd\n");
+	}
+#endif
+	
+	if (data) {
+		initrd_start = data;
+		initrd_end   = initrd_start + len;
+		printf ("   Loading Ramdisk to %08lx, end %08lx ... ",
+			initrd_start, initrd_end);
+		memmove ((void *)initrd_start, (void *)data, len);
+		printf ("OK\n");
+	} else {
+		initrd_start = 0;
+		initrd_end = 0;
+	}
+	
+	base_ptr = load_zimage(addr + sizeof(image_header_t), ntohl(hdr->ih_size), 
+			       initrd_start, initrd_end-initrd_start, 0);
+
+	if (NULL == base_ptr) {
+		printf ("## Kernel loading failed ...\n");
+		do_reset(cmdtp, flag, argc, argv);
+		
+	}
+		
+#ifdef DEBUG
+	printf ("## Transferring control to Linux (at address %08x) ...\n",
+		(u32)base_ptr);
+#endif
+		
+	/* we assume that the kernel is in place */
+	printf("\nStarting kernel ...\n\n");
+		
+	boot_zimage(base_ptr);
+	
+}
+
+