arm: Add support for semihosting for armv8 fastmodel targets.

The armv8 ARM Trusted Firmware (ATF) can be used to load various ATF
images and u-boot, and does this for virtual platforms by using
semihosting. This commit extends this idea by allowing u-boot to also
use semihosting to load the kernel/ramdisk/dtb. This eliminates the need
for a bootwrapper and produces a more realistic boot sequence with
virtual models.

Though the semihosting code is quite generic, support for armv7 in
fastmodel is less useful due to the wide range of available silicon
and the lack of a free armv7 fastmodel, so this change contains an
untested armv7 placeholder for the service trap opcode.

Please refer to doc/README.semihosting for a more detailed description
of semihosting and how it is used with the armv8 virtual platforms.

Signed-off-by: Darwin Rambo <drambo@broadcom.com>
Cc: trini@ti.com
Cc: fenghua@phytium.com.cn
Cc: bhupesh.sharma@freescale.com

1 files changed, 56 insertions, 7 deletions

diff --git a/include/configs/vexpress_aemv8a.h b/include/configs/vexpress_aemv8a.h
index dff6adc..1905d13 100644
--- a/include/configs/vexpress_aemv8a.h
+++ b/include/configs/vexpress_aemv8a.h
@@ -10,9 +10,20 @@
 
 #define DEBUG
 
+#ifdef CONFIG_BASE_FVP
+#ifndef CONFIG_SEMIHOSTING
+#error CONFIG_BASE_FVP requires CONFIG_SEMIHOSTING
+#endif
+#define CONFIG_BOARD_LATE_INIT
+#define CONFIG_ARMV8_SWITCH_TO_EL1
+#endif
+
 #define CONFIG_REMAKE_ELF
 
+#ifndef CONFIG_BASE_FVP
+/* Base FVP not using GICv3 yet */
 #define CONFIG_GICV3
+#endif
 
 /*#define CONFIG_ARMV8_SWITCH_TO_EL1*/
 
@@ -30,8 +41,14 @@
 #define CONFIG_BOOTP_VCI_STRING		"U-boot.armv8.vexpress_aemv8a"
 
 /* Link Definitions */
+#ifdef CONFIG_BASE_FVP
+/* ATF loads u-boot here for BASE_FVP model */
+#define CONFIG_SYS_TEXT_BASE		0x88000000
+#define CONFIG_SYS_INIT_SP_ADDR         (CONFIG_SYS_SDRAM_BASE + 0x03f00000)
+#else
 #define CONFIG_SYS_TEXT_BASE		0x80000000
 #define CONFIG_SYS_INIT_SP_ADDR         (CONFIG_SYS_SDRAM_BASE + 0x7fff0)
+#endif
 
 /* Flat Device Tree Definitions */
 #define CONFIG_OF_LIBFDT
@@ -39,7 +56,11 @@
 #define CONFIG_DEFAULT_DEVICE_TREE	vexpress64
 
 /* SMP Spin Table Definitions */
+#ifdef CONFIG_BASE_FVP
+#define CPU_RELEASE_ADDR		(CONFIG_SYS_SDRAM_BASE + 0x03f00000)
+#else
 #define CPU_RELEASE_ADDR		(CONFIG_SYS_SDRAM_BASE + 0x7fff0)
+#endif
 
 /* CS register bases for the original memory map. */
 #define V2M_PA_CS0			0x00000000
@@ -99,9 +120,15 @@
 #define GICD_BASE			(0x2f000000)
 #define GICR_BASE			(0x2f100000)
 #else
+
+#ifdef CONFIG_BASE_FVP
+#define GICD_BASE			(0x2f000000)
+#define GICC_BASE			(0x2c000000)
+#else
 #define GICD_BASE			(0x2C001000)
 #define GICC_BASE			(0x2C002000)
 #endif
+#endif
 
 #define CONFIG_SYS_MEMTEST_START	V2M_BASE
 #define CONFIG_SYS_MEMTEST_END		(V2M_BASE + 0x80000000)
@@ -121,7 +148,6 @@
 #define CONFIG_CONS_INDEX		0
 
 #define CONFIG_BAUDRATE			115200
-#define CONFIG_SYS_BAUDRATE_TABLE	{ 9600, 19200, 38400, 57600, 115200 }
 #define CONFIG_SYS_SERIAL0		V2M_UART0
 #define CONFIG_SYS_SERIAL1		V2M_UART1
 
@@ -165,17 +191,41 @@
 #define CONFIG_SYS_SDRAM_BASE		PHYS_SDRAM_1
 
 /* Initial environment variables */
+#ifdef CONFIG_BASE_FVP
+#define CONFIG_EXTRA_ENV_SETTINGS	\
+				"kernel_name=uImage\0"	\
+				"kernel_addr_r=0x80000000\0"	\
+				"initrd_name=ramdisk.img\0"	\
+				"initrd_addr_r=0x88000000\0"	\
+				"fdt_name=devtree.dtb\0"		\
+				"fdt_addr_r=0x83000000\0"		\
+				"fdt_high=0xffffffffffffffff\0"	\
+				"initrd_high=0xffffffffffffffff\0"
+
+#define CONFIG_BOOTARGS		"console=ttyAMA0 earlyprintk=pl011,"\
+				"0x1c090000 debug user_debug=31 "\
+				"loglevel=9"
+
+#define CONFIG_BOOTCOMMAND	"fdt addr $fdt_addr_r; fdt resize; " \
+				"fdt chosen $initrd_addr_r $initrd_end; " \
+				"bootm $kernel_addr_r - $fdt_addr_r"
+
+#define CONFIG_BOOTDELAY		1
+
+#else
+
 #define CONFIG_EXTRA_ENV_SETTINGS	\
-					"kernel_addr=0x200000\0"	\
-					"initrd_addr=0xa00000\0"	\
+					"kernel_addr_r=0x200000\0"	\
+					"initrd_addr_r=0xa00000\0"	\
 					"initrd_size=0x2000000\0"	\
-					"fdt_addr=0x100000\0"		\
+					"fdt_addr_r=0x100000\0"		\
 					"fdt_high=0xa0000000\0"
 
 #define CONFIG_BOOTARGS			"console=ttyAMA0 root=/dev/ram0"
-#define CONFIG_BOOTCOMMAND		"bootm $kernel_addr " \
-					"$initrd_addr:$initrd_size $fdt_addr"
+#define CONFIG_BOOTCOMMAND		"bootm $kernel_addr_r " \
+					"$initrd_addr_r:$initrd_size $fdt_addr_r"
 #define CONFIG_BOOTDELAY		-1
+#endif
 
 /* Do not preserve environment */
 #define CONFIG_ENV_IS_NOWHERE		1
@@ -187,7 +237,6 @@
 #define CONFIG_SYS_PBSIZE		(CONFIG_SYS_CBSIZE + \
 					sizeof(CONFIG_SYS_PROMPT) + 16)
 #define CONFIG_SYS_HUSH_PARSER
-#define CONFIG_SYS_PROMPT_HUSH_PS2	"> "
 #define CONFIG_SYS_BARGSIZE		CONFIG_SYS_CBSIZE
 #define CONFIG_SYS_LONGHELP
 #define CONFIG_CMDLINE_EDITING		1