board: starfive: function to read eMMC size
The EEPROM provides information about the size of the eMMC.
Provide a new function get_mmc_size_from_eeprom() to read it.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: E. Shattow <lucent@gmail.com>
diff --git a/arch/riscv/include/asm/arch-jh7110/eeprom.h b/arch/riscv/include/asm/arch-jh7110/eeprom.h
index 62d184a..45ad2a5 100644
--- a/arch/riscv/include/asm/arch-jh7110/eeprom.h
+++ b/arch/riscv/include/asm/arch-jh7110/eeprom.h
@@ -13,6 +13,13 @@
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
*
* A string like "VF7110A1-2228-D008E000-00000001" is returned.
diff --git a/board/starfive/visionfive2/Kconfig b/board/starfive/visionfive2/Kconfig
index 2186a93..d7e8a7a 100644
--- a/board/starfive/visionfive2/Kconfig
+++ b/board/starfive/visionfive2/Kconfig
@@ -50,4 +50,13 @@
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
diff --git a/board/starfive/visionfive2/visionfive2-i2c-eeprom.c b/board/starfive/visionfive2/visionfive2-i2c-eeprom.c
index 5095a0e..9648a27 100644
--- a/board/starfive/visionfive2/visionfive2-i2c-eeprom.c
+++ b/board/starfive/visionfive2/visionfive2-i2c-eeprom.c
@@ -548,6 +548,24 @@
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"