x86: Fix coreboot config to boot on Chromebook

The config is current broken. It compiles but does not boot because IDE is
enabled. Remove all IDE options, and enable SCSI instead.

Also add a working boot command and Linux bootargs, and enable command
line editing to make it easier to work with.

Signed-off-by: Simon Glass <sjg@chromium.org>

include/configs/coreboot.h

@@ -39,7 +39,9 @@
 #define CONFIG_LAST_STAGE_INIT
 #define CONFIG_X86_NO_RESET_VECTOR
 #define CONFIG_SYS_VSNPRINTF
+#define CONFIG_INTEL_CORE_ARCH	/* Sandy bridge and ivy bridge chipsets. */
 #define CONFIG_ZBOOT_32
+#define CONFIG_PHYSMEM
 
 /*-----------------------------------------------------------------------
  * Watchdog Configuration
@@ -104,18 +106,9 @@
 #define CONFIG_SYS_STDIO_DEREGISTER
 #define CONFIG_CBMEM_CONSOLE
 
-/* max. 1 IDE bus	*/
-#define CONFIG_SYS_IDE_MAXBUS		1
-/* max. 1 drive per IDE bus */
-#define CONFIG_SYS_IDE_MAXDEVICE	(CONFIG_SYS_IDE_MAXBUS * 1)
-
-#define CONFIG_SYS_ATA_BASE_ADDR	CONFIG_SYS_ISA_IO_BASE_ADDRESS
-#define CONFIG_SYS_ATA_IDE0_OFFSET	0x01f0
-#define CONFIG_SYS_ATA_IDE1_OFFSET	0x0170
-#define CONFIG_SYS_ATA_DATA_OFFSET	0
-#define CONFIG_SYS_ATA_REG_OFFSET	0
-#define CONFIG_SYS_ATA_ALT_OFFSET	0x200
-
+#define CONFIG_CMDLINE_EDITING
+#define CONFIG_COMMAND_HISTORY
+#define CONFIG_AUTOCOMPLETE
 
 #define CONFIG_SUPPORT_VFAT
 /************************************************************
@@ -181,14 +174,19 @@
 #define CONFIG_CMD_SETGETDCR
 #define CONFIG_CMD_SOURCE
 #define CONFIG_CMD_XIMG
-#define CONFIG_CMD_IDE
+#define CONFIG_CMD_SCSI
+
 #define CONFIG_CMD_FAT
 #define CONFIG_CMD_EXT2
 
 #define CONFIG_CMD_ZBOOT
 
 #define CONFIG_BOOTDELAY	2
-#define CONFIG_BOOTARGS		"root=/dev/mtdblock0 console=ttyS0,9600"
+#define CONFIG_BOOTARGS		\
+	"root=/dev/sdb3 init=/sbin/init rootwait ro"
+#define CONFIG_BOOTCOMMAND	\
+	"ext2load scsi 0:3 01000000 /boot/vmlinuz; zboot 01000000"
+
 
 #if defined(CONFIG_CMD_KGDB)
 #define CONFIG_KGDB_BAUDRATE			115200