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For a raspberrypi image, mainly there are two partitions, kernel and rootfs.  The size of kernel image is 6M.  Rootfs is mounted on  SD card and its value can be increased using gparted or similar tool.  By default while flashing an  image to SD card, two partitions are created, namely mmcblk0p1 and mmcblk0p2. rootfs image is stored in mmcblk0p2 whereas mmcblk0p1 holds boot information.

The details of sd card partions and its sizes can be found using "fdsik -l command"

root@raspberrypi-rdk-hybrid:~# fdisk -l
Disk /dev/mmcblk0: 14 GB, 15552479232 bytes, 30375936 sectors
474624 cylinders, 4 heads, 16 sectors/track
Units: sectors of 1 * 512 = 512 bytes

Device       Boot StartCHS    EndCHS        StartLBA     EndLBA    Sectors  Size Id Type
/dev/mmcblk0p1 *  64,0,1      841,0,32          8192     107679      99488 48.5M  c Win95 FAT32 (LBA)
/dev/mmcblk0p2    896,0,1     1023,3,32       114688   10711039   10596352 5174M 83 Linux
root@raspberrypi-rdk-hybrid:~# 


Memory Usage

root@raspberrypi-rdk-hybrid:~# df -h
Filesystem                   Size          Used        Available   Use%      Mounted on
/dev/root                    865.5M    552.0M     252.0M        69%        /
devtmpfs                   339.6M         0            339.6M        0%           /dev
tmpfs                          468.1M      8.0K        468.1M         0%          /dev/shm
tmpfs                         194.3M      8.8M        185.6M         5%         /run
tmpfs                          468.1M         0            468.1M        0%         /sys/fs/cgroup
tmpfs                          468.1M      6.6M        461.5M       1%          /tmp
tmpfs                          468.1M      6.6M        461.5M       1%          /etc/snmp/snmpd.conf
tmpfs                          468.1M      236.0K    467.9M        0%        /var/volatile
/dev/root                   865.5M      552.0M    252.0M       69%      /var/lib
/dev/mmcblk0p1      48.5M        27.4M     21.0M          57%      /boot
tmpfs                            93.6M         0            93.6M          0%        /run/user/0
root@raspberrypi-rdk-hybrid
root@raspberrypi-rdk-hybrid:~#  free -lh
                        total         used        free          shared    buff/cache   available
Mem:           936M        571M        217M         26M           147M        311M
Low:           936M          718M        217M
High:            0B               0B          0B
Swap:            0B              0B          0B
root@raspberrypi-rdk-hybrid:~#

Boot memory Information

ComponentSize
Kernel code9216K
RW data737K
RO data2928K
init1024K
BSS853K
vmalloc1097K
cma  total262K
KernelStack2536 kB
Shmem14596 kB
tmpfs95876k
devtmpfs347800k


Changing tmpfs partition size

   Size of tmpfs partition can be changed by using fstab. Below are the list of tmpfs partitions

tmpfs                   468.1M      4.0K     468.1M   0%   /dev/shm
tmpfs                   194.3M      8.8M     185.5M   5%   /run
tmpfs                   468.1M         0         468.1M   0%   /sys/fs/cgroup
tmpfs                   468.1M      2.2M     466.0M   0%    /tmp
tmpfs                   468.1M      2.2M      466.0M   0%   /etc/snmp/snmpd.conf
tmpfs                   468.1M    320.0K    467.8M   0%    /var/volatile
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