nios2: call board_init_f_mem

We will need CONFIG_SYS_MALLOC_F_LEN to use serial uclass.
So we shall undefine CONFIG_SYS_GENERIC_GLOBAL_DATA, and
call board_init_f_mem() to allocates early malloc() memory
with size of CONFIG_SYS_MALLOC_F_LEN in board_f.c.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Marek Vasut <marex@denx.de>

arch/nios2/cpu/start.S

@@ -120,6 +120,16 @@ _reloc:
 	stw	r0, 4(sp)
 	mov	fp, sp
 
+	/* Allocate and zero GD, update SP */
+	mov	r4, sp
+	movhi	r2, %hi(board_init_f_mem@h)
+	ori	r2, r2, %lo(board_init_f_mem@h)
+	callr	r2
+
+	/* Update stack- and frame-pointers */
+	mov	sp, r2
+	mov	fp, sp
+
 	/*
 	 * Call board_init_f -- never returns
 	 */

arch/nios2/include/asm/config.h

@@ -7,6 +7,4 @@
 #ifndef _ASM_CONFIG_H_
 #define _ASM_CONFIG_H_
 
-#define CONFIG_SYS_GENERIC_GLOBAL_DATA
-
 #endif