mx6qsabresd: Document the mapping of USDHC[2-4]

This documents the SD card identifier so it is easier for user to spot
which card number will be used, if need.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>

diff --git a/board/freescale/mx6qsabresd/mx6qsabresd.c b/board/freescale/mx6qsabresd/mx6qsabresd.c
index 2b3926aaf3aa53a33367e9040ab2a9aaf5cb199a..5ebbff3f8c1460854e4017fb93d0019e7f310fef 100644 (file)
--- a/board/freescale/mx6qsabresd/mx6qsabresd.c
+++ b/board/freescale/mx6qsabresd/mx6qsabresd.c
@@ -160,6 +160,13 @@ int board_mmc_init(bd_t *bis)
 {
        int i;
 
+       /*
+        * According to the board_mmc_init() the following map is done:
+        * (U-boot device node)    (Physical Port)
+        * mmc0                    SD2
+        * mmc1                    SD3
+        * mmc2                    eMMC
+        */
        for (i = 0; i < CONFIG_SYS_FSL_USDHC_NUM; i++) {
                switch (i) {
                case 0: