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Altera_Forum
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9 years ago

make_sdimage.py creates invalid ext3 partition

I am using the make_sdimage.py to create a 128G SD image. Parameters to the script are: -s 117G -n sd_mage-128G.bin -P u-boot-with-spl.sfp,num=1,format=raw,size=1M,type=A2 -P...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

This is an old thread, but since I faced similar problems and found a solution, here's a reply anyway.

I had parameters to make_sdimage.py for four partitions: 

			sudo $(PATH_HPS_BIN)/make_sdimage.py 
				-s 7464M 
				-n $(SD_IMG) 
				-P $(DIR_BSP)/preloader-mkpimage.bin,$(DIR_BSP)/uboot-socfpga/u-boot.img,num=3,format=raw,size=1M,type=A2 
				-P zImage,$(DIR_IMG)/socfpga.dtb,num=2,format=ext3,size=1023M 
				-P rootfs,num=1,format=ext3,size=1G 
				-P num=4,format=ext3,size=5G

I found, by instrumenting make_sdimage.py, that it correctly computes sizes and offsets, and passes them to fdisk. The actual layout created by fdisk differs from the requested parameters, and has gaps between the end of one partition and the start of the next: 

Disk /dev/sdb: 7.3 GiB, 7826571264 bytes, 15286272 sectors                                                                                                                                                                             
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xf5526d7a
Device     Boot   Start      End  Sectors  Size Id Type
/dev/sdb1          2048  2099199  2097152    1G 83 Linux
/dev/sdb2       2099201  4194303  2095103 1023M 83 Linux
/dev/sdb3       4194306  4196351     2046 1023K a2 unknown
/dev/sdb4       4196355 14682111 10485757    5G 83 Linux

Changing the requested partitioning slightly (1G instead of 1023M, the "-s 7200M" was done for other reasons): 

			sudo $(PATH_HPS_BIN)/make_sdimage.py 
				-s 7200M 
				-n $(SD_IMG) 
				-P $(DIR_BSP)/preloader-mkpimage.bin,$(DIR_BSP)/uboot-socfpga/u-boot.img,num=3,format=raw,size=1M,type=A2 
				-P zImage,$(DTB_BASE).dtb,num=2,format=ext3,size=1G 
				-P rootfs,num=1,format=ext3,size=1G 
				-P num=4,format=ext3,size=5G

gives a regular partitioning (and working EXT3 file systems): 

Command (m for help): p
Disk ../build/QWG/sd_image_yocto.bin: 7 GiB, 7549747200 bytes, 14745600 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xd784cd63
Device                           Boot   Start      End  Sectors Size Id Type
../build/QWG/sd_image_yocto.bin1         2048  2099199  2097152   1G 83 Linux
../build/QWG/sd_image_yocto.bin2      2099200  4196351  2097152   1G 83 Linux
../build/QWG/sd_image_yocto.bin3      4196352  4198399     2048   1M a2 unknown
../build/QWG/sd_image_yocto.bin4      4198400 14684159 10485760   5G 83 Linux