venice: display DRAM MR registers and decoding if debug enabled

While this is interesting and useful for debugging there isn't extremely
useful information so we will only show it if debug is enabled.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

diff --git a/board/gateworks/venice/spl.c b/board/gateworks/venice/spl.c
index d9bc593fa0d575b97be0c15107be32b142994f5c..2c303211d3280a1735f9aab9a1152d7bf5ee73d7 100644 (file)
--- a/board/gateworks/venice/spl.c
+++ b/board/gateworks/venice/spl.c
@@ -271,7 +271,65 @@ void board_init_f(ulong dummy)
                       dram_timing->fsp_msg[0].drate,
                       dram_timing->fsp_msg[0].drate / 2,
                       dram_desc[0] ? dram_desc : "");
-               puts("\n");
+
+#ifdef DEBUG
+               u8 mr[9] = { 0 };
+               /* Read MR5-MR8 to obtain details about DRAM part (and verify DRAM working) */
+               for (i = 5; i < 9; i++)
+                       mr[i] = lpddr4_mr_read(0xf, i) & 0xff;
+
+               printf(" (0x%02x%02x%02x%02x", mr[5], mr[6], mr[7], mr[8]);
+               /* MR5 MFG_ID */
+               switch (mr[5]) {
+               case 0xff:
+                       printf(" Micron");
+                       break;
+               default:
+                       break;
+               }
+               /* MR8 OP[7:6] Width */
+               i = 0;
+               switch ((mr[8] >> 6) & 0x3) {
+               case 0:
+                       i = 16;
+                       break;
+               case 1:
+                       i = 8;
+                       break;
+               }
+               if (i)
+                       printf(" x%d", i);
+               /* MR8 OP[5:2] Density */
+               i = 0;
+               switch ((mr[8] >> 2) & 0xf) {
+               case 0:
+                       i = 4;
+                       break;
+               case 1:
+                       i = 6;
+                       break;
+               case 2:
+                       i = 8;
+                       break;
+               case 3:
+                       i = 12;
+                       break;
+               case 4:
+                       i = 16;
+                       break;
+               case 5:
+                       i = 24;
+                       break;
+               case 6:
+                       i = 32;
+                       break;
+               default:
+                       break;
+               }
+               if (i)
+                       printf(" %dGb per die", i);
+#endif
+               puts(")\n");
        } else {
                hang();
        }