[U-Boot] [PATCH 6/6] board: ge: Store bootcount in EEPROM on PPD and Bx50v3

Tue Jun 26 17:43:04 UTC 2018

From: Denis Zalevskiy <denis.zalevskiy at ge.com>

u-boot's ext3/4 write/modify functionality sometimes corrupts filesystem in the
case if it requires recovery (e.g. after unexpected shutdown) and we want to
avoid the only filesystem modification we have - bootcounter writing. So,
bootcounter will be stored in the EEPROM where VPD is stored.

Signed-off-by: Denis Zalevskiy <denis.zalevskiy at ge.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.co.uk>
---
 board/ge/common/vpd_reader.c | 20 ++++++++++++++++++++
 configs/ge_bx50v3_defconfig  | 18 ++++++++++++++----
 configs/mx53ppd_defconfig    | 19 +++++++++++++++----
 include/configs/ge_bx50v3.h  |  6 +++---
 include/configs/mx53ppd.h    |  6 +++---
 5 files changed, 55 insertions(+), 14 deletions(-)

diff --git a/board/ge/common/vpd_reader.c b/board/ge/common/vpd_reader.c
index 60f81342f9bc..7f1f8bca1baf 100644
--- a/board/ge/common/vpd_reader.c
+++ b/board/ge/common/vpd_reader.c
@@ -6,6 +6,7 @@
 
 #include "vpd_reader.h"
 
+#include <linux/bug.h>
 #include <i2c.h>
 #include <linux/bch.h>
 #include <stdlib.h>
@@ -201,7 +202,26 @@ int read_vpd(struct vpd_cache *cache,
 	     int (*process_block)(struct vpd_cache *, u8 id, u8 version,
 				  u8 type, size_t size, u8 const *data))
 {
+#if defined(CONFIG_BOOTCOUNT_I2C) &&					\
+	(CONFIG_SYS_BOOTCOUNT_I2C_BUS == CONFIG_SYS_VPD_EEPROM_I2C_BUS) && \
+	((CONFIG_SYS_BOOTCOUNT_I2C_ADDR & 0xf0) == CONFIG_SYS_VPD_EEPROM_I2C_ADDR)
+	/*
+	 * bootcount is expected to reside at the end of EEPROM
+	 *
+	 * check is hard-wired to the logic of the 24C08 EEPROM 256-bytes
+	 * page-wise (4 pages) i2c_address/bootcount_address structure combined
+	 * with raw I2C access, so the I2C address and offset are combined into:
+	 *
+	 *     i2c_addr = (device_i2c_addr | page),
+	 *     offset = (offset - (page * 256)))
+	 */
+	BUILD_BUG_ON((CONFIG_SYS_BOOTCOUNT_I2C_ADDR & 0x0f) * 256 +
+		     CONFIG_SYS_BOOTCOUNT_ADDR + CONFIG_BOOTCOUNT_I2C_LEN !=
+		     CONFIG_SYS_VPD_EEPROM_SIZE);
+	static const size_t size = CONFIG_SYS_BOOTCOUNT_ADDR;
+#else
 	static const size_t size = CONFIG_SYS_VPD_EEPROM_SIZE;
+#endif
 
 	int res;
 	u8 *data;
diff --git a/configs/ge_bx50v3_defconfig b/configs/ge_bx50v3_defconfig
index 829a39e08567..32a9200ea988 100644
--- a/configs/ge_bx50v3_defconfig
+++ b/configs/ge_bx50v3_defconfig
@@ -16,6 +16,20 @@ CONFIG_SYS_VPD_EEPROM_I2C_ADDR=0x50
 CONFIG_SYS_VPD_EEPROM_I2C_ADDR_LEN=1
 CONFIG_SYS_VPD_EEPROM_SIZE=1024
 
+CONFIG_BOOTCOUNT_I2C=y
+CONFIG_BOOTCOUNT_LIMIT=y
+CONFIG_SYS_BOOTCOUNT_I2C_BUS=4
+# bootcount is stored in VPD EEPROM
+# we are using generic driver instead of EEPROM one (while should use it)
+# at the end of VPD EEPROM: (SYS_VPD_EEPROM_SIZE - CONFIG_BOOTCOUNT_I2C_LEN)
+# so, the address is 0x3FE:
+#     ("VPD EEPROM chip address" | "3rd 256-byte page"):
+CONFIG_SYS_BOOTCOUNT_I2C_ADDR=0x53
+#     (+ "offset in the page"):
+CONFIG_SYS_BOOTCOUNT_ADDR=0xfe
+CONFIG_BOOTCOUNT_I2C_LEN=2
+CONFIG_BOOTCOUNT_ALEN=1
+
 CONFIG_SUPPORT_RAW_INITRD=y
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_LAST_STAGE_INIT=y
@@ -35,10 +49,6 @@ CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_DOS_PARTITION=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
-CONFIG_BOOTCOUNT_LIMIT=y
-CONFIG_BOOTCOUNT_EXT=y
-CONFIG_SYS_BOOTCOUNT_EXT_DEVPART="1:5"
-CONFIG_SYS_BOOTCOUNT_ADDR=0x7000A000
 CONFIG_FSL_ESDHC=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
diff --git a/configs/mx53ppd_defconfig b/configs/mx53ppd_defconfig
index 4a7e8eee0df1..43672d88e202 100644
--- a/configs/mx53ppd_defconfig
+++ b/configs/mx53ppd_defconfig
@@ -18,6 +18,21 @@ CONFIG_SYS_VPD_EEPROM_I2C_ADDR=0x50
 CONFIG_SYS_VPD_EEPROM_I2C_ADDR_LEN=1
 CONFIG_SYS_VPD_EEPROM_SIZE=1024
 
+CONFIG_BOOTCOUNT_LIMIT=y
+CONFIG_BOOTCOUNT_I2C=y
+# using bus where monitor's EEPROM is connected to
+CONFIG_SYS_BOOTCOUNT_I2C_BUS=2
+# bootcount is stored in Monitor's VPD EEPROM
+# we are using generic driver instead of EEPROM one (while should use it)
+# at the end of VPD EEPROM: (SYS_VPD_EEPROM_SIZE - CONFIG_BOOTCOUNT_I2C_LEN)
+# so, the address is 0x3FE:
+#     ("VPD EEPROM chip address" | "3rd 256-byte page"):
+CONFIG_SYS_BOOTCOUNT_I2C_ADDR=0x53
+#     (+ "offset in the page"):
+CONFIG_SYS_BOOTCOUNT_ADDR=0xfe
+CONFIG_BOOTCOUNT_I2C_LEN=2
+CONFIG_BOOTCOUNT_ALEN=1
+
 CONFIG_SUPPORT_RAW_INITRD=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
@@ -33,10 +48,6 @@ CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_ENV_IS_IN_MMC=y
-CONFIG_BOOTCOUNT_LIMIT=y
-CONFIG_BOOTCOUNT_EXT=y
-CONFIG_SYS_BOOTCOUNT_EXT_DEVPART="0:5"
-CONFIG_SYS_BOOTCOUNT_ADDR=0x7000A000
 CONFIG_FSL_ESDHC=y
 CONFIG_NETDEVICES=y
 CONFIG_RTC_S35392A=y
diff --git a/include/configs/ge_bx50v3.h b/include/configs/ge_bx50v3.h
index 307ec0101c0a..5576fd33d48d 100644
--- a/include/configs/ge_bx50v3.h
+++ b/include/configs/ge_bx50v3.h
@@ -118,9 +118,9 @@
 		"setenv stdout vga; " \
 		"echo \"\n\n\n\n    \" $msg; " \
 		"setenv stdout serial; " \
-		"mw.b 0x7000A000 0xbc; " \
-		"mw.b 0x7000A001 0x00; " \
-		"ext4write ${dev} ${devnum}:5 0x7000A000 /boot/failures 2\0" \
+		"i2c dev 4; " \
+		"i2c mw.b 53 fe bc; " \
+		"i2c mw.b 53 ff 00; \0" \
 	"altbootcmd=" \
 		"run doquiet; " \
 		"setenv partnum 1; run hasfirstboot || setenv partnum 2; " \
diff --git a/include/configs/mx53ppd.h b/include/configs/mx53ppd.h
index 338f1434f2cc..549efc10c5e9 100644
--- a/include/configs/mx53ppd.h
+++ b/include/configs/mx53ppd.h
@@ -130,9 +130,9 @@
 		"setenv stdout vga; " \
 		"echo \"\n\n\n\n    \" $msg; " \
 		"setenv stdout serial; " \
-		"mw.b 0x7000A000 0xbc; " \
-		"mw.b 0x7000A001 0x00; " \
-		"ext4write ${dev} ${devnum}:5 0x7000A000 /boot/failures 2\0" \
+		"i2c dev 2; " \
+		"i2c mw.b 53 fe bc; " \
+		"i2c mw.b 53 ff 00; \0" \
 	"altbootcmd=" \
 		"run doquiet; " \
 		"setenv partnum 1; run hasfirstboot || setenv partnum 2; " \
-- 
2.18.0

