board: spacemit-k3: SPL skeleton

arch/riscv/cpu/k3/Kconfig

@@ -9,8 +9,11 @@
 config SPACEMIT_K3
 	bool
 	select ARCH_EARLY_INIT_R
+	select SUPPORT_SPL
+	select SPL
 	imply CPU
 	imply CPU_RISCV
+	imply SPL_CPU
 	imply RISCV_ISA_ZICBOM
 
 if SPACEMIT_K3
@@ -18,4 +21,23 @@ if SPACEMIT_K3
 config SYS_CPU
 	default "k3"
 
+config SPL_SMP
+	default n
+
+config SPL_TEXT_BASE
+	hex
+	default 0xc0801000
+
+config SPL_MAX_SIZE
+	hex
+	default 0x6AF00
+
+config SPL_BSS_START_ADDR
+	hex
+	default 0xc0874000
+
+config SPL_BSS_MAX_SIZE
+	hex
+	default 0x3000
+
 endif

arch/riscv/cpu/k3/spl.c

@@ -0,0 +1,11 @@
+#include <config.h>
+#include <linux/types.h>
+#include <asm/spl.h>
+
+void board_boot_order(u32 *spl_boot_list)
+{
+	/* Boot from SPI NOR with YMODEM UART fallback. */
+	spl_boot_list[0] = BOOT_DEVICE_SPI;
+	spl_boot_list[1] = BOOT_DEVICE_UART;
+	spl_boot_list[2] = BOOT_DEVICE_NONE;
+}