HAL_ChibiOS: reduce dataflash buffer size on targets with 128KB ram

libraries/AP_HAL_ChibiOS/hwdef/MatekF405/hwdef.dat

@@ -152,6 +152,8 @@ SPIDEV sdcard    SPI3 DEVID1 SDCARD_CS  MODE0 400*KHZ 25*MHZ
 define HAL_OS_FATFS_IO 1
 define HAL_BOARD_LOG_DIRECTORY "/APM/LOGS"
 define HAL_BOARD_TERRAIN_DIRECTORY "/APM/TERRAIN"
+define HAL_DATAFLASH_FILE_BUFSIZE 8
+define HAL_DATAFLASH_MAV_BUFSIZE 2
 
 # 8 PWM available by default
 define BOARD_PWM_COUNT_DEFAULT 8

libraries/AP_HAL_ChibiOS/hwdef/f4by-ch/hwdef.dat

@@ -106,6 +106,8 @@ define HAL_OS_FATFS_IO 1
 # now some defines for logging and terrain data files
 define HAL_BOARD_LOG_DIRECTORY "/APM/LOGS"
 define HAL_BOARD_TERRAIN_DIRECTORY "/APM/TERRAIN"
+define HAL_DATAFLASH_FILE_BUFSIZE 8
+define HAL_DATAFLASH_MAV_BUFSIZE 2
 
 # this defines the default maximum clock on I2C devices.
 define HAL_I2C_MAX_CLOCK 100000

libraries/AP_HAL_ChibiOS/hwdef/omnibusf4pro/hwdef.dat

@@ -109,6 +109,8 @@ define HAL_STORAGE_SIZE 15360
 define HAL_OS_FATFS_IO 1
 define HAL_BOARD_LOG_DIRECTORY "/APM/LOGS"
 define HAL_BOARD_TERRAIN_DIRECTORY "/APM/TERRAIN"
+define HAL_DATAFLASH_FILE_BUFSIZE 8
+define HAL_DATAFLASH_MAV_BUFSIZE 2
 
 # define default battery setup
 define HAL_BATT_VOLT_PIN 12