riscv: qemu: Use different SYS_TEXT_BASE for S-mode

When u-boot runs in S-mode, the M-mode runtime firmware
(BBL or equivalent) uses memory range in 0x80000000 to
0x80200000. Due to this, we cannot use 0x80000000 as
SYS_TEXT_BASE when running in S-mode. Instead for S-mode,
we use 0x80200000 as SYS_TEXT_BASE.

Even Linux RISC-V kernel ignores/reserves memory range
0x80000000 to 0x80200000 because it runs in S-mode.
Signed-off-by: NAnup Patel <anup@brainfault.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
Tested-by: NBin Meng <bmeng.cn@gmail.com>
Reviewed-by: NLukas Auer <lukas.auer@aisec.fraunhofer.de>

board/emulation/qemu-riscv/Kconfig

@@ -13,7 +13,8 @@ config SYS_CONFIG_NAME
 	default "qemu-riscv"
 
 config SYS_TEXT_BASE
-	default 0x80000000
+	default 0x80000000 if !RISCV_SMODE
+	default 0x80200000 if RISCV_SMODE
 
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y