[coreboot-gerrit] Change in coreboot[master]: mb/prodrive/hermes: Cache check_board_settings_checksum

[Patrick Rudolph (Code Review)]

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/48646 )

Change subject: mb/prodrive/hermes: Cache check_board_settings_checksum
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mb/prodrive/hermes: Cache check_board_settings_checksum

Change-Id: I46e063fd9c2808ae427bdbfb3a8b0a63c59dec47
Signed-off-by: Patrick Rudolph 
---
M src/mainboard/prodrive/hermes/eeprom.c
1 file changed, 13 insertions(+), 4 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/46/48646/1

diff --git a/src/mainboard/prodrive/hermes/eeprom.c b/src/mainboard/prodrive/hermes/eeprom.c
index f88b587..a0bb639 100644
--- a/src/mainboard/prodrive/hermes/eeprom.c
+++ b/src/mainboard/prodrive/hermes/eeprom.c
@@ -42,6 +42,12 @@
    struct eeprom_board_settings BoardSettings;
    uint32_t crc;

+	static bool checked;
+	static bool valid;
+
+	if (checked)
+		goto out;
+
    if (read_write_config(&BoardSettings, off, 0, sizeof(BoardSettings))) {
    	printk(BIOS_ERR, "CFG EEPROM: Failed to read board settings\n");
    	return 0;
@@ -49,11 +55,14 @@

crc = CRC(((uint8_t *)&BoardSettings) + sizeof(uint32_t),
    	  sizeof(BoardSettings) - sizeof(uint32_t), crc32_byte);
-	if (crc != BoardSettings.signature) {
+
+	valid = crc == BoardSettings.signature;
+	checked = true;
+out:
+	if (!valid)
    	printk(BIOS_ERR, "CFG EEPROM: Board settings have invalid checksum\n");
-		return 0;
-	}
-	return 1;
+
+	return valid;
 }

/* Read data from offset and write it to offset in UPD */