@@ -12,6 +12,13 @@
u8 get_pcb_revision_from_eeprom(void);
u32 get_ddr_size_from_eeprom(void);
+/**
+ * get_mmc_size_from_eeprom() - read eMMC size from EEPROM
+ *
+ * @return: size in GiB or 0 on error.
+ */
+u32 get_mmc_size_from_eeprom(void);
+
/**
* get_product_id_from_eeprom - get product ID string
*
@@ -50,4 +50,13 @@ config BOARD_SPECIFIC_OPTIONS # dummy
imply PHY_LIB
imply PHY_MSCC
+config STARFIVE_NO_EMMC
+ bool "Report eMMC size as zero"
+ help
+ The serial number string in the EEPROM is meant to report the
+ size of onboard eMMC. Unfortunately some Milk-V Mars CM Lite
+ modules without eMMC show a non-zero size here.
+
+ Set to 'Y' if you have a Mars CM Lite module.
+
endif
@@ -548,6 +548,24 @@ u32 get_ddr_size_from_eeprom(void)
return hextoul(&pbuf.eeprom.atom1.data.pstr[14], NULL);
}
+u32 get_mmc_size_from_eeprom(void)
+{
+ u32 size;
+
+ if (IS_ENABLED(CONFIG_STARFIVE_NO_EMMC))
+ return 0;
+
+ if (read_eeprom())
+ return 0;
+
+ size = dectoul(&pbuf.eeprom.atom1.data.pstr[19], NULL);
+
+ if (pbuf.eeprom.atom1.data.pstr[21] == 'T')
+ size <<= 10;
+
+ return size;
+}
+
U_BOOT_LONGHELP(mac,
"\n"
" - display EEPROM content\n"