[PATCH v2 1/1] smbios: add extended Extended BIOS ROM Size

[Heinrich Schuchardt]

U-Boot claims to create SMBIOS 3.7 tables. The type 0 table has
a field Extended BIOS ROM Size since version 3.1.

BIOS ROM sizes of 16 MiB or above must be written to this field.

Add and fill the missing field.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
v2:
	Replace 0x01000000 by SZ_16M
---
 include/smbios.h | 1 +
 lib/smbios.c     | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/smbios.h b/include/smbios.h
index a4fda9df7bd..00119d7a60c 100644
--- a/include/smbios.h
+++ b/include/smbios.h
@@ -105,6 +105,7 @@ struct __packed smbios_type0 {
 	u8 bios_minor_release;
 	u8 ec_major_release;
 	u8 ec_minor_release;
+	u16 extended_bios_rom_size;
 	char eos[SMBIOS_STRUCT_EOS_BYTES];
 };
 
diff --git a/lib/smbios.c b/lib/smbios.c
index 4126466e34a..7c24ea129eb 100644
--- a/lib/smbios.c
+++ b/lib/smbios.c
@@ -22,6 +22,7 @@
 #include <cpu.h>
 #include <dm/uclass-internal.h>
 #endif
+#include <linux/sizes.h>
 
 /* Safeguard for checking that U_BOOT_VERSION_NUM macros are compatible with U_BOOT_DMI */
 #if U_BOOT_VERSION_NUM < 2000 || U_BOOT_VERSION_NUM > 2099 || \
@@ -348,7 +349,13 @@ static int smbios_write_type0(ulong *current, int handle,
 #endif
 	t->bios_release_date = smbios_add_prop(ctx, NULL, U_BOOT_DMI_DATE);
 #ifdef CONFIG_ROM_SIZE
-	t->bios_rom_size = (CONFIG_ROM_SIZE / 65536) - 1;
+	if (CONFIG_ROM_SIZE < SZ_16M) {
+		t->bios_rom_size = (CONFIG_ROM_SIZE / 65536) - 1;
+	} else {
+		/* CONFIG_ROM_SIZE < 8 GiB */
+		t->bios_rom_size = 0xff;
+		t->extended_bios_rom_size = CONFIG_ROM_SIZE >> 20;
+	}
 #endif
 	t->bios_characteristics = BIOS_CHARACTERISTICS_PCI_SUPPORTED |
 				  BIOS_CHARACTERISTICS_SELECTABLE_BOOT |
-- 
2.45.2