[U-Boot] [PATCH] arm64: zynqmp: Add comment about level shifter mode v1

[Michal Simek]

Silicon v1 didn't support SD boot mode with level shifter.
Because system can't boot any error message is not shown
that's why comment is just a record if someone tries to debug it.

Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

 arch/arm/cpu/armv8/zynqmp/spl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/cpu/armv8/zynqmp/spl.c b/arch/arm/cpu/armv8/zynqmp/spl.c
index e5a413954a5b..779497ca6d0b 100644
--- a/arch/arm/cpu/armv8/zynqmp/spl.c
+++ b/arch/arm/cpu/armv8/zynqmp/spl.c
@@ -84,7 +84,7 @@ u32 spl_boot_device(void)
 		return BOOT_DEVICE_RAM;
 #ifdef CONFIG_SPL_MMC_SUPPORT
 	case SD_MODE1:
-	case SD1_LSHFT_MODE:
+	case SD1_LSHFT_MODE: /* not working on silicon v1 */
 /* if both controllers enabled, then these two are the second controller */
 #if defined(CONFIG_ZYNQ_SDHCI0) && defined(CONFIG_ZYNQ_SDHCI1)
 		return BOOT_DEVICE_MMC2;
-- 
1.9.1