google/slippy: populate PEI SPD data for all channels

Since dual-channel setups use same RAM/SPD for both channels,
populate spd_data[1] with same SPD data as spd_data[0],
allowing info for both channels to propogate into the
SBMIOS tables.

Clean up calculations using SPD length to avoid repetition.

Changes modeled after google/auron variants.

Change-Id: I7e14b35642a3fbaecaeb7d1d33b5a7c1405bac45
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/19981
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/mainboard/google/slippy/variants/falco/romstage.c b/src/mainboard/google/slippy/variants/falco/romstage.c
index 8254bc2..81174db 100644
--- a/src/mainboard/google/slippy/variants/falco/romstage.c
+++ b/src/mainboard/google/slippy/variants/falco/romstage.c
@@ -74,6 +74,7 @@
 	int spd_index = get_gpios(gpio_vector);
 	char *spd_file;
 	size_t spd_file_len;
+	size_t spd_len = sizeof(peid->spd_data[0]);
 
 	printk(BIOS_DEBUG, "SPD index %d\n", spd_index);
 	spd_file = cbfs_boot_map_with_leak("spd.bin", CBFS_TYPE_SPD,
@@ -81,27 +82,27 @@
 	if (!spd_file)
 		die("SPD data not found.");
 
-	if (spd_file_len <
-	    ((spd_index + 1) * sizeof(peid->spd_data[0]))) {
+	if (spd_file_len < ((spd_index + 1) * spd_len)) {
 		printk(BIOS_ERR, "SPD index override to 0 - old hardware?\n");
 		spd_index = 0;
 	}
 
-	if (spd_file_len < sizeof(peid->spd_data[0]))
+	if (spd_file_len < spd_len)
 		die("Missing SPD data.");
 
+	memcpy(peid->spd_data[0], spd_file + (spd_index * spd_len), spd_len);
+
 	/* Index 0-2,6 are 4GB config with both CH0 and CH1
 	 * Index 3-5,7 are 2GB config with CH0 only
 	 */
 	switch (spd_index) {
+	case 0: case 1: case 2: case 6:
+		memcpy(peid->spd_data[1],
+			spd_file + (spd_index * spd_len), spd_len);
+		break;
 	case 3: case 4: case 5: case 7:
 		peid->dimm_channel1_disabled = 3;
 	}
-
-	memcpy(peid->spd_data[0],
-	       spd_file +
-	       spd_index * sizeof(peid->spd_data[0]),
-	       sizeof(peid->spd_data[0]));
 }
 
 void variant_romstage_entry(unsigned long bist)