armv8: ls1046ardb: Add falcon mode for for QSPI boot

A new defconfig is introduced to support SPL boot from QSPI NOR
flash. This is to support falcon mode for faster booting into
Linux.

Signed-off-by: York Sun <york.sun@nxp.com>

2 files changed, 13 insertions, 0 deletions

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/doc/README.falcon b/arch/arm/cpu/armv8/fsl-layerscape/doc/README.falcon
index a00b5bc9c3..7dae9f03c3 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/doc/README.falcon
+++ b/arch/arm/cpu/armv8/fsl-layerscape/doc/README.falcon
@@ -129,6 +129,16 @@ Example:
 
 The "loadables" is not optional. It tells SPL which images to load into memory.
 
+Falcon mode with QSPI boot
+--------------------------
+To use falcon mode with QSPI boot, SPL needs to be enabled. Similar to SD or
+NAND boot, a RAM version full feature U-Boot is needed. Unlike SD or NAND boot,
+SPL with QSPI doesn't need to combine SPL image with RAM version image. Two
+separated images are used, u-boot-spl.pbl and u-boot.img. The former is SPL
+image with RCW and PBI commands to load the SPL payload into On-Chip RAM. The
+latter is RAM version U-Boot in FIT format (or legacy format if FIT is not
+used).
+
 Other things to consider
 -----------------------
 Falcon boot skips a lot of initialization in U-Boot. If Linux expects the
diff --git a/arch/arm/cpu/armv8/fsl-layerscape/spl.c b/arch/arm/cpu/armv8/fsl-layerscape/spl.c
index 3bb6e5b3db..3e53084b21 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/spl.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/spl.c
@@ -23,6 +23,9 @@ u32 spl_boot_device(void)
 #ifdef CONFIG_SPL_NAND_SUPPORT
 	return BOOT_DEVICE_NAND;
 #endif
+#ifdef CONFIG_QSPI_BOOT
+	return BOOT_DEVICE_NOR;
+#endif
 	return 0;
 }