LATEST   
Email

28 July, 2011

Free more available disk space from NAND - PART I

The nand partitions layout in Samsung Galaxy S I9000 is controlled by a pit file (Partition Information Table), while for the mmc drive, it is hard coded in the init file.

For example, in Samsung Galaxy S I9000, the stock partition tables for s1_odin_20100512.pit should look like this:

NAND disk */dev/block/stl1 - stl6 omitted
device name mount point size in MB remarks
/dev/block/stl7 n/a 7.5 known as KERNEL, for holding zImage
/dev/block/stl8 n/a 7.5 known as RECOVERY, for storing a copy of zImage
/dev/block/stl9 /system 286.5 known as FACTORYFS
/dev/block/stl10 /dbdata 134 known as DBDATA
/dev/block/stl11 /cache 35 known as CACHE
/dev/block/stl12 n/a 7.5 known as MODEM, for storing modem.bin
MMC disk
device name mount point size in MB remarks
/dev/block/mmcblk0p1 /mnt/sdcard (/sdcard) ~6200 (8G) / ~14200 (16G) none
/dev/block/mmcblk0p2 /data ~2000 none

For other pit files like s1_odin_20100513 and s1_odin_20100803, the size of /system and /dbdata are different. So for a larger /system partition, a smaller /dbdata and/or /cache will be resulted and vice versa since the total size of the nand is fixed (~500MB)

When we flash a rom to our phone, the above information will be read by odin to decide where the files will be stored. For instance, the zImage will be written to /dev/block/stl7 (/dev/block/bml7) and /dev/block/stl8 (/dev/block/bml8), while the FACTORYFS.rfs will be stored on /dev/block/stl9 (or /dev/block/bml9) at a specific start block address, up to the size of the file and so forth.

As a result, if we wanna use our own customized partition layout, we have to deal with the pit file and the mmc via fdisk or parted, etc


read more:
Free more available disk space from NAND - PART II
freeNANDmod - get more space from NAND - PART III
freeNANDmod - get more space from NAND - PART IV




for more details, read:
Investigation Into PIT Files
The reality of PIT files

Facebook Comments
0 Blogger Comments
Facebook Comments by Blogger Widgets

0 comments:

Loading