MTKPartitionLayout
Mediatek uses some tools to generate it's partitions and manage the MMC.
It uses a xls source file and a tool called ptgen.pl to generate headers for handling partitions.
Ptgen generates headers for all the devices needing to access the storage:
- The preloader.
- U-Boot.
- lk (the Android bootloader doinng fastboot and such).
- The Linux kernel.
- The scatter files used for uploading and flashing the device.
CUSTOM_MEMORYDEVICE_H_NAME = "mediatek/custom/$PROJECT/preloader/inc/custom_MemoryDevice.h";
PARTITION_DEFINE_H_NAME = "mediatek/custom/$PROJECT/common/partition_define.h"; #
PARTITION_DEFINE_C_NAME = "mediatek/platform/$platform/kernel/drivers/dum-char/partition_define.c";
EMMC_PART_SIZE_LOCATION = "mediatek/config/$PROJECT/configs/EMMC_partition_size.mk" ; # store the partition size for ext4 buil
my $PMT_H_NAME = "mediatek/custom/$PROJECT/common/pmt.h";
#for autogen uboot preload and kernel partition struct
ProjectConfig ="mediatek/config/$PROJECT/ProjectConfig.mk";
UbootH ="mediatek/custom/$PROJECT/uboot/inc/mt65xx_partition.h";
UbootC ="mediatek/custom/$PROJECT/uboot/mt65xx_partition.c";
PreloaderH ="mediatek/custom/$PROJECT/preloader/inc/cust_part.h";
PreloaderC ="mediatek/custom/$PROJECT/preloader/cust_part.c";
KernelH ="mediatek/custom/$PROJECT/kernel/core/src/partition.h";
Uboot_PartitionC = "mediatek/custom/$PROJECT/uboot/partition.c";
LK_CUSTOM = "mediatek/custom/$PROJECT/lk";
LK_CUSTOM_INC = "mediatek/custom/$PROJECT/lk/inc";
LK_MT_PartitionH = "mediatek/custom/$PROJECT/lk/inc/mt_partition.h";
LK_PartitionC = "mediatek/custom/$PROJECT/lk/partition.c";
LK_CUSTOM_OUT_LK = "mediatek/custom/out/$FULL_PROJECT/lk";
LK_CUSTOM_OUT_LK_INC = "mediatek/custom/out/$FULL_PROJECT/lk/inc";
mediatek/custom/ahong89_wet_jb2/lk/inc/mt_partition.h mediatek/custom/ahong89_wet_jb2/lk/partition.c mediatek/custom/ahong89_wet_jb2/common/partition_define.h
Mapping of data to MBR EBR1 and EBR2 mediatek/platform/mt6589/kernel/drivers/dum-char/partition_define.c
Partitions and start address. mediatek/platform/mt6589/kernel/drivers/mmc-host/part_info_emmc.c
The dumchar.c driver is the kernel driver exposing partitions to userland. This is where a lot of magic happens.
Random info from the driver:
There are 3 address in eMMC Project: Linear Address, Logical Address, Physical Address
Linear Address: Used in scatter file, uboot, preloader,flash tool etc.
Linear Address: MBR linear address is fixed in eMMCComo.mk, that is same for all chips in the project
Logical Address: Used in /proc/dumchar_info, mmcblk0 etc. MBR logical address is 0
Physical Address: Used in eMMC driver, MBR Physical Address = MBR Linear Address - (BOOT1 size + BOOT2 Size + RPMB Size)
define User_Region_Header (BOOT1 size + BOOT2 Size + RPMB Size)
/* Anotated content of a scatter file */
PRELOADER 0x0
MBR 0x600000 /* Master boot record */
EBR1 0x680000 /* MTK extention like a Master boot record */
__NODL_PMT 0x700000 /* Something related to the partition(a binary version of scatter files) */
__NODL_PRO_INFO 0xb00000
__NODL_NVRAM 0xe00000 /* Storage for factory date serial number etc */
__NODL_PROTECT_F 0x1300000
__NODL_PROTECT_S 0x1d00000
__NODL_SECCFG 0x2700000
UBOOT 0x2720000 /* Uboot boot loader
BOOTIMG 0x2780000 /* Normal boot kernel/rootfs */
RECOVERY 0x2d80000 /* Recovery kernel/rootfs */
SEC_RO 0x3380000
__NODL_MISC 0x3980000
LOGO 0x3a00000 /* Animated boot logo */
EBR2 0x3d00000 /* Second extended boot record */
__NODL_EXPDB 0x3d80000
ANDROID 0x4780000 /* The Android /system partition */
CACHE 0x2d180000 /* The /cache partition */
USRDATA 0x34f80000 /* The /data partition */
__NODL_FAT 0x74f80000 /* The FAT partition */
130|root@android:/proc # cat emmc
partno: start_sect nr_sects partition_name
emmc_p1: 00000400 00000002 "ebr1"
emmc_p2: 00006800 00005000 "protect_f"
emmc_p3: 0000b800 00005000 "protect_s"
emmc_p4: 00016c00 00003000 "sec_ro"
emmc_p5: 00020c00 00145000 "android"
emmc_p6: 00165c00 0003f000 "cache"
emmc_p7: 001a4c00 00200000 "usrdata"
emmc_p8: 003a4c00 019f9d00 "fat"
root@android:/proc # cat dumchar_info
Part_Name Size StartAddr Type MapTo
preloader 0x0000000000600000 0x0000000000000000 2 /dev/misc-sd
mbr 0x0000000000080000 0x0000000000000000 2 /dev/block/mmcblk0
ebr1 0x0000000000080000 0x0000000000080000 2 /dev/block/mmcblk0p1
pmt 0x0000000000400000 0x0000000000100000 2 /dev/block/mmcblk0
pro_info 0x0000000000300000 0x0000000000500000 2 /dev/block/mmcblk0
nvram 0x0000000000500000 0x0000000000800000 2 /dev/block/mmcblk0
protect_f 0x0000000000a00000 0x0000000000d00000 2 /dev/block/mmcblk0p2
protect_s 0x0000000000a00000 0x0000000001700000 2 /dev/block/mmcblk0p3
seccfg 0x0000000000020000 0x0000000002100000 2 /dev/block/mmcblk0
uboot 0x0000000000060000 0x0000000002120000 2 /dev/block/mmcblk0
bootimg 0x0000000000600000 0x0000000002180000 2 /dev/block/mmcblk0
recovery 0x0000000000600000 0x0000000002780000 2 /dev/block/mmcblk0
sec_ro 0x0000000000600000 0x0000000002d80000 2 /dev/block/mmcblk0p4
misc 0x0000000000080000 0x0000000003380000 2 /dev/block/mmcblk0
logo 0x0000000000300000 0x0000000003400000 2 /dev/block/mmcblk0
ebr2 0x0000000000080000 0x0000000003700000 2 /dev/block/mmcblk0
expdb 0x0000000000a00000 0x0000000003780000 2 /dev/block/mmcblk0
android 0x0000000028a00000 0x0000000004180000 2 /dev/block/mmcblk0p5
cache 0x0000000007e00000 0x000000002cb80000 2 /dev/block/mmcblk0p6
usrdata 0x0000000040000000 0x0000000034980000 2 /dev/block/mmcblk0p7
fat 0x000000033f3a0000 0x0000000074980000 2 /dev/block/mmcblk0p8
bmtpool 0x0000000001500000 0x00000000ff9f00a8 2 /dev/block/mmcblk0
Part_Name:Partition name you should open;
Size:size of partition
StartAddr:Start Address of partition;
Type:Type of partition(MTD=1,EMMC=2)
MapTo:actual device you operate