arm64: zynqmp: Add comment about level shifter mode v1

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@xilinx.com>

diff --git a/arch/arm/cpu/armv8/zynqmp/spl.c b/arch/arm/cpu/armv8/zynqmp/spl.c
index db7432fd4bd76f46fadf992d50f4ec41f503ab11..26bf80ec52b49d5831d5092eb6531598a44ff8d7 100644 (file)
--- 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;