Problem in short:
*eMMC partition's device files are not visible in /dev/ directory after
partitiong using "sfdisk"*
HI ,
I have put log of script here, any suggestions,
+ partition_emmc /dev/mmcblk0
+ DRIVE=/dev/mmcblk0
+ HEADS=255
+ SECTOR_SIZE=512
+ SECTORS_PER_TRACK=63
*+ dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=108108+0 records in108+0
records out+ sync+ dd if=/dev/mmcblk0 of=/dev/null bs=1M count=108108+0
records in*
108+0 records out
+ sync
+ blockdev --flushbufs /dev/mmcblk0
+ + grepgrep+ bytes Disk
fdisk -l /dev/mmcblk0
+ awk {print $5}
+ SIZE=3841982464
+ echo DISK SIZE - 3841982464 bytes
DISK SIZE - 3841982464 bytes
+ echo 3841982464 255 / 63 / 512 / p
+ dc
+ CYLINDERS=467.094
+ echo CYLINDERS - 467.094
CYLINDERS - 467.094
+ sfdisk -R /dev/mmcblk0
BLKRRPART: Device or resource busy
sfdisk: This disk is currently in use.
+
+ [ 1 -ne 0 ]
+ + + grepawk /dev/mmcblk0 {print $3}
mount
+ mntpoint=/media/mmcblk0p8
/media/mmcblk0p6
/media/mmcblk0p7
/media/mmcblk0p5
+ echo unmounting /media/mmcblk0p8
unmounting /media/mmcblk0p8
+ umount /media/mmcblk0p8
+ echo unmounting /media/mmcblk0p6
unmounting /media/mmcblk0p6
+ umount /media/mmcblk0p6
+ echo unmounting /media/mmcblk0p7
unmounting /media/mmcblk0p7
+ umount /media/mmcblk0p7
+ echo unmounting /media/mmcblk0p5
unmounting /media/mmcblk0p5
+ umount /media/mmcblk0p5
+ sfdisk --force --in-order --Linux -H 255 -S 63 -C 467.094 /dev/mmcblk0 -uM
Checking that no-one is using this disk right now ...
OK
Disk /dev/mmcblk0: 467 cylinders, 255 heads, 63 sectors/track
sfdisk: ERROR: sector 184348 does not have an msdos signature
sfdisk: /dev/mmcblk0: unrecognized partition table type
Old situation:
sfdisk: No partitions found
New situation:
Units = mebibytes of 1048576 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End MiB #blocks Id System
/dev/mmcblk0p1 * 0+ 31 32- 32767+ c W95 FAT32 (LBA)
/dev/mmcblk0p2 32 231 200 204800 83 Linux
/dev/mmcblk0p3 232 431 200 204800 83 Linux
/dev/mmcblk0p4 432 3663 3232 3309568 5 Extended
/dev/mmcblk0p5 432+ 531 100- 102399+ 83 Linux
/dev/mmcblk0p6 532+ 591 60- 61439+ 83 Linux
/dev/mmcblk0p7 592+ 791 200- 204799+ 83 Linux
/dev/mmcblk0p8 792+ 2060 1269- 1299455+ 83 Linux
/dev/mmcblk0p9 2061+ 3663 1603- 1641471+ 83 Linux
Successfully wrote the new partition table
Re-reading the partition table ...
If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
to zero the first 512 bytes: dd if=/dev/zero of=/dev/foo7 bs=512 count=1
(See fdisk(8).)
+ sync
+ blockdev --flushbufs /dev/mmcblk0
+ partprobe
Auto-mount of [/media/mmcblk0p5] successful
Auto-mount of [/media/mmcblk0p6] successful
Auto-mount of [/media/mmcblk0p7] successful
Auto-mount of [/media/mmcblk0p8] successful
*Error: Error informing the kernel about modifications to partition
/dev/mmcblk0p5 -- Device or r.Error: Failed to add partition 5 (Device or
resource busy)*
+ rm -rf /tmp/.a*
*+ mdev -s*
mount: mounting /dev/mmcblk0p1 on /media/mmcblk0p1 failed: Invalid argument
rm: can't remove '/tmp/.automount-mmcblk0p1': No such file or directory
mount: mounting /dev/mmcblk0p2 on /media/mmcblk0p2 failed: Invalid argument
rm: can't remove '/tmp/.automount-mmcblk0p2': No such file or directory
mount: mounting /dev/mmcblk0p3 on /media/mmcblk0p3 failed: Invalid argument
rm: can't remove '/tmp/.automount-mmcblk0p3': No such file or directory
mount: mounting /dev/mmcblk0p4 on /media/mmcblk0p4 failed: Invalid argument
rm: can't remove '/tmp/.automount-mmcblk0p4': No such file or directory
rm: can't remove '/tmp/.automount-mmcblk0p7': No such file or directory
rm: can't remove '/tmp/.automount-mmcblk0p8': No such file or directory
+ sync
+ blockdev --flushbufs /dev/mmcblk0
*+ mount*
rootfs on / type rootfs (rw)
192.168.1.3:/nfsboot on / type nfs
(rw,relatime,vers=2,rsize=4096,wsize=4096,namlen=255,hard,nol)
proc on /proc type proc (rw,relatime)
sysfs on /sys type sysfs (rw,relatime)
tmpfs on /tmp type tmpfs (rw,relatime)
none on /dev/pts type devpts (rw,relatime,mode=600)
tmpfs on /dev/shm type tmpfs (rw,relatime,mode=777)
tmpfs on /var/run type tmpfs (rw,relatime,mode=777)
tmpfs on /var/spool/cron type tmpfs (rw,relatime,mode=755)
tmpfs on /var/sftp type tmpfs (rw,relatime,mode=755)
*+ sfdisk -R /dev/mmcblk0+ + [ 0 -ne 0 ]+ echo Nothing is mounted on
/dev/mmcblk0Nothing is mounted on /dev/mmcblk0*
+ RETRY=50
+ NO_OF_PARTITIONS=2
+ 2 != 10
./BAK_S99-flashfirmware: line 1: 2: not found
+ check_and_format_partition /dev/mmcblk0p2 rootfs
+ PARTITION=/dev/mmcblk0p2
+ LABEL=rootfs
+ MNTPNT=0
+ mount
+ grep /dev/mmcblk0p2
+ awk {print $3}
+ MNTPNT=
+ [ -n ]
+ [ -b /dev/mmcblk0p2 ]
+ mkfs.ext4 -L rootfs /dev/mmcblk0p2
mke2fs 1.42.8 (20-Jun-2013)
*Auto-mount of [/media/mmcblk0p5] successfulmkfs.ext4: No such file or
directory while trying to determine hardware sector size+
check_and_format_partition /dev/mmcblk0p3 rootfs2+
PARTITION=/dev/mmcblk0p3+ LABEL=rootfs2*
+ MNTPNT=0
+ mount
+ grep+ awk /dev/mmcblk0p3
{print $3}
Auto-mount of [/media/mmcblk0p8] successful
+ MNTPNT=
+ [ -n ]
+ [ -b /dev/mmcblk0p3 ]
+ echo Cant find /dev/mmcblk0p3 partition
Cant find /dev/mmcblk0p3 partition
+ check_and_format_partition /dev/mmcblk0p5 recovery_rootfs
+ PARTITION=/dev/mmcblk0p5
+ LABEL=recovery_rootfs
+ MNTPNT=0
+ mount
+ grep /dev/mmcblk0p5+ awk {print $3}
+ MNTPNT=/media/mmcblk0p5
+ [ -n /media/mmcblk0p5 ]
+ echo /dev/mmcblk0p5 is mounted on /media/mmcblk0p5
/dev/mmcblk0p5 is mounted on /media/mmcblk0p5
+ [ -b /dev/mmcblk0p5 ]
+ echo Cant find /dev/mmcblk0p5 partition
Cant find /dev/mmcblk0p5 partition
+ check_and_format_partition /dev/mmcblk0p6 database
+ PARTITION=/dev/mmcblk0p6
+ LABEL=database
+ MNTPNT=0
+ mount
+ grep /dev/mmcblk0p6
+ awk {print $3}
Auto-mount of [/media/mmcblk0p7] successful
+ MNTPNT=
+ [ -n ]
+ [ -b /dev/mmcblk0p6 ]
+ mkfs.ext4 -L database /dev/mmcblk0p6
Auto-mount of [/media/mmcblk0p6] successful
mke2fs 1.42.8 (20-Jun-2013)
/dev/mmcblk0p6 is mounted; will not make a filesystem here!
+ check_and_format_partition /dev/mmcblk0p7 firmware
+ PARTITION=/dev/mmcblk0p7
+ LABEL=firmware
+ MNTPNT=0
+ grep /dev/mmcblk0p7
+ mount
+ awk {print $3}
+ MNTPNT=/media/mmcblk0p7
+ [ -n /media/mmcblk0p7 ]
+ echo /dev/mmcblk0p7 is mounted on /media/mmcblk0p7
/dev/mmcblk0p7 is mounted on /media/mmcblk0p7
+ [ -b /dev/mmcblk0p7 ]
+ mkfs.ext4 -L firmware /dev/mmcblk0p7
mke2fs 1.42.8 (20-Jun-2013)
/dev/mmcblk0p7 is mounted; will not make a filesystem here!
+ check_and_format_partition /dev/mmcblk0p8 logging
+ PARTITION=/dev/mmcblk0p8
+ LABEL=logging
+ MNTPNT=0
+ grep /dev/mmcblk0p8
+ awk {print $3}
+ mount
+ MNTPNT=/media/mmcblk0p8
+ [ -n /media/mmcblk0p8 ]
+ echo /dev/mmcblk0p8 is mounted on /media/mmcblk0p8
/dev/mmcblk0p8 is mounted on /media/mmcblk0p8
+ [ -b /dev/mmcblk0p8 ]
+ echo Cant find /dev/mmcblk0p8 partition
Cant find /dev/mmcblk0p8 partition
+ sed -r s/://g
+ cat /sys/class/net/eth0/address
+ MACADDRESS=7c669d19cce2
+ BASE_MOUNT_POINT=/mnt/7c669d19cce2
+ ROOTFS_MOUNT=/mnt/7c669d19cce2/rootfs
+ ROOTFS2_MOUNT=/mnt/7c669d19cce2/rootfs2
+ ROOTFS_RECOVERY_MOUNT=/mnt/7c669d19cce2/recovery_rootfs
+ DB_MOUNT=/mnt/7c669d19cce2/database
+ FIRMWARE_MOUNT=/mnt/7c669d19cce2/firmware
+ LOGGING_MOUNT=/mnt/7c669d19cce2/logging
+ echoAndLog mount all the partitions
+ echo mount all the partitions
mount all the partitions
+ logger -p 5 -t ./BAK_S99-flashfirmware mount all the partitions
+ [ ! -d /mnt/7c669d19cce2/rootfs ]
+ [ ! -d /mnt/7c669d19cce2/rootfs2 ]
+ [ ! -d /mnt/7c669d19cce2/recovery_rootfs ]
+ [ ! -d /mnt/7c669d19cce2/database ]
+ RETRY=50
+ [ 50 -ne 0 ]
+ [ ! -b /dev/mmcblk0p2 ]
+ echo ....Waiting till /dev/mmcblk0p2 appears retry=50
....Waiting till /dev/mmcblk0p2 appears retry=50
Anything fishy ?? If same partitioning command i run from command prompt it
works but not from script do you suggestion anything ?
Script looks as show below..
DRIVE="/dev/mmcblk0"
RFS1_PARTITION=${DRIVE}p2
RFS2_PARTITION=${DRIVE}p3
RECOVERYRFS_PARTITION=${DRIVE}p5
DATABASE_PARTITION=${DRIVE}p6
FIRMWARE_PARTITION=${DRIVE}p7
LOGGING_PARTITION=${DRIVE}p8
partition_emmc()
{
DRIVE=$1
HEADS=255
SECTOR_SIZE=512
SECTORS_PER_TRACK=63
#Clear the first 512KB of the disk to clear MBR
dd if=/dev/zero of=${DRIVE} bs=1M count=108
sync
dd if=${DRIVE} of=/dev/null bs=1M count=108
sync
blockdev --flushbufs
${DRIVE}
#Get the size of the disk
SIZE=$(fdisk -l $DRIVE | grep "Disk" | grep bytes | awk '{print
$5}')
echo "DISK SIZE - $SIZE
bytes"
#calculate the no of cylinders in the
disk
CYLINDERS=$(echo "$SIZE $HEADS / $SECTORS_PER_TRACK / $SECTOR_SIZE
/ p" | dc )
echo "CYLINDERS -
$CYLINDERS"
#Check if any of the partition is mounted, umount it if
mounted.
$(sfdisk -R
${DRIVE})
if [ $? -ne 0
];then
mntpoint=$(mount | grep ${DRIVE} | awk '{print
$3}')
for i in $mntpoint ;
do
echo "unmounting
$i"
umount
$i
done
else
echo "Nothing is mounted on ${DRIVE}"
fi
#Partition drive
# sfdisk --force --in-order --Linux -H 255 -S 63 -C $CYLINDERS
${DRIVE} -uM <<-__EOF__
sfdisk --force --in-order --Linux -H 255 -S 63 -C 467 ${DRIVE} -uM
<<-__EOF__
,32,C,*
,200,L
,200,L
,,E
,100,L
,60,L
,200,L
,1269,L
,,,-
__EOF__
}
# arg1 = partition
# arg2 = label
check_and_format_partition()
{
PARTITION=$1
LABEL=$2
MNTPNT=0
MNTPNT=$(mount | grep $PARTITION | awk '{print $3}')
if [ -n "$MNTPNT" ]; then
echo "$PARTITION is mounted on $MNTPNT"
fi
if [ -b $PARTITION ]; then
mkfs.ext4 -L $LABEL $PARTITION
#TODO : Find correct tunning parameter and set it.
#tune2fs
else
echo "Cant find $PARTITION partition"
fi
}
#Partition the eMMC
partition_emmc $DRIVE
sync
blockdev --flushbufs $DRIVE
partprobe
rm -rf /tmp/.a*
#Trigger the creation of the device files
mdev -s
sync
blockdev --flushbufs $DRIVE
mount
$(sfdisk -R ${DRIVE})
if [ $? -ne 0 ]; then
mntpoint=$(mount | grep ${DRIVE} | awk '{print $3}')
for i in $mntpoint ; do
echo "unmounting $i"
umount $i
done
else
echo "Nothing is mounted on ${DRIVE}"
fi
#Wait till mmcblk0pX partitions are available.
RETRY=50
NO_OF_PARTITIONS=2
while (( $NO_OF_PARTITIONS != 10 )); do
while (( [ $RETRY -ne 0 ] && [ ! -b "${DRIVE}p$i" ] )); do
echo "....Waiting till $RFS1_PARTITION appears"
RETRY=`expr $RETRY - 1`
sleep 1
done
if [ $RETRY -eq 0 ];then
echo "Error..Device files are not present"
exit 1;
fi
NO_OF_PARTITIONS=`expr NO_OF_PARTITIONS + 1`
done
#Format the partitions
check_and_format_partition $RFS1_PARTITION $RFS_STRING
check_and_format_partition $RFS2_PARTITION $RFS2_STRING
check_and_format_partition $RECOVERYRFS_PARTITION $RFS_RECOVERY_STRING
check_and_format_partition $DATABASE_PARTITION $DATABASE_STRING
check_and_format_partition $FIRMWARE_PARTITION $FIRMWARE_STRING
check_and_format_partition $LOGGING_PARTITION $LOGGING_STRING
MACADDRESS=`cat /sys/class/net/eth0/address | sed -r 's/://g'`
BASE_MOUNT_POINT=/mnt/$MACADDRESS
ROOTFS_MOUNT=$BASE_MOUNT_POINT/rootfs
ROOTFS2_MOUNT=$BASE_MOUNT_POINT/rootfs2
ROOTFS_RECOVERY_MOUNT=$BASE_MOUNT_POINT/recovery_rootfs
DB_MOUNT=$BASE_MOUNT_POINT/database
FIRMWARE_MOUNT=$BASE_MOUNT_POINT/firmware
LOGGING_MOUNT=$BASE_MOUNT_POINT/logging
echoAndLog "mount all the partitions"
#Create mount point if it doesn't exist.
if [ ! -d "$ROOTFS_MOUNT" ]; then
mkdir -p $ROOTFS_MOUNT
fi
if [ ! -d "$ROOTFS2_MOUNT" ]; then
mkdir -p $ROOTFS2_MOUNT
fi
if [ ! -d "$ROOTFS_RECOVERY_MOUNT" ]; then
mkdir -p $ROOTFS_RECOVERY_MOUNT
fi
if [ ! -d "$DB_MOUNT" ]; then
mkdir -p $DB_MOUNT
fi
}
On Thursday, 23 April 2015 10:33:33 UTC+5:30, Ankur Tank wrote:
>
> Oh that was the problem..I was referring JDEC spec and all :)
>
> Thank you very much for reply Mr. Nelson,
> 7 Partition problem solved :)
>
> Let me know if you have any suggestions for other problems.
> One more questions,
>
> # blkid
> /dev/mmcblk0p2: LABEL="rootfs" UUID="3bb8e52f-1434-4e04-9d76-a50d75380c39"
> TYPE="ext4"
> /dev/mmcblk0p5: LABEL="recovery_rootfs"
> UUID="5f8060da-b692-4278-9120-af0258579e12" TYPE="ext4"
> /dev/mmcblk0p8: LABEL=*"logging" *UUID="72064afc-e114-4339-89cd-76725fedbc86"
> TYPE="ext4"
> /dev/mmcblk0p3: LABEL="rootfs2"
> UUID="0287571c-6965-4906-91d0-347ec26f7aea" TYPE="ext4"
> /dev/mmcblk0p7: LABEL="firmware"
> UUID="b812c1a2-12dc-4543-b4f5-1bfc5f4c4e0a" TYPE="ext4"
> */dev/mmcblk0boot0: LABEL="logging"
> UUID="72064afc-e114-4339-89cd-76725fedbc86" TYPE="ext4"*
> /dev/mmcblk0p6: LABEL="database"
> UUID="45b8786e-bcb2-457d-8796-e78f9188aa55" TYPE="ext4"
>
> Why is */dev/mmcblk0boot0* appears here, it doesn't show up in fdisk -l
> output?
> from where is this mysterious partition coming from?
>
>
> On Thursday, 23 April 2015 08:16:33 UTC+5:30, RobertCNelson wrote:
>>
>> On Wed, Apr 22, 2015 at 9:25 PM, Ankur Tank <[email protected]> wrote:
>> > I am writing firmware(MLO,u-boot.img, uImage(ver 3.12), dtb,
>> rootfs.tar.gz)
>> > programming script for
>> > am335x based custom board which is based on Beaglebone black.
>> > Rootfile system is to be put onto the eMMC.
>> > Firmware programming script runs as the one of the init script from
>> > the nfsroot folder when board boots for the first time at programming
>> > station.
>> >
>> > Basically script
>> > 1. Partitions the eMMC and
>> > 2. writes MLO, u-boot.img, uImage, dtb in the raw area of the first
>> > partition and
>> > 3. Then formats the other partitions as ext4 and
>> > 4. mounts ext4 partitions and extacts the rootfs.tar.gz.
>> >
>> > Now there are two issues with the script and one with backup kernel
>> memory
>> > area.
>> >
>> > Script issues
>> >
>> > 1. I am not able create more than 7 partition(including logical
>> partitions)
>> > though sfdisk creates the partitions, device files related to
>> partition
>> > is not available in /dev directory
>> >
>> > Here is sfdisk command i used
>> >
>> > #Partition emmc
>> > sfdisk -D -H 255 -S 63 -C 467 /dev/mmcblk0 -uM << EOF
>> > ,32,C,*
>> > ,200,L
>> > ,200,L
>> > ,,E
>> > ,100,L
>> > ,60,L
>> > ,200,L
>> > ;1269,L
>> > ;
>> > EOF
>> >
>> > When i list the partitions fdisk/sfdisk reports 8 partitions but i
>> don't see
>> > partition files related to 8th partition.
>> >
>> > Here is fdisk output for the same,
>> >
>> > # fdisk -l /dev/mmcblk0
>> >
>> > Disk /dev/mmcblk0: 3841 MB, 3841982464 bytes
>> > 255 heads, 63 sectors/track, 467 cylinders
>> > Units = cylinders of 16065 * 512 = 8225280 bytes
>> >
>> > Device Boot Start End Blocks Id System
>> > /dev/mmcblk0p1 * 1 5 40131 c Win95
>> FAT32
>> > (LBA)
>> > /dev/mmcblk0p2 6 31 208845 83 Linux
>> > /dev/mmcblk0p3 32 57 208845 83 Linux
>> > /dev/mmcblk0p4 58 467 3293325 5 Extended
>> > /dev/mmcblk0p5 58 70 104391 83 Linux
>> > /dev/mmcblk0p6 71 78 64228+ 83 Linux
>> > /dev/mmcblk0p7 79 104 208813+ 83 Linux
>> > /dev/mmcblk0p8 105 266 1301233+ 83 Linux
>> > /dev/mmcblk0p9 267 467 1614501 83 Linux
>> >
>> > 2. Some times after partitioning eMMC device files(/dev/mmcblk0p2,
>> > /dev/mmcblk0p3 etc) doesn't appear and mkfs utility fails to format the
>> > partition and firmware flashing fails.
>> >
>> > I used partprobe after partitioning eMMC but with not help. :(
>> >
>> > eMMC memory issue
>> >
>> > First partition of the eMMC is of type "Win95 FAT32 (LBA)"
>> > We are not formatting this partition and using it as raw.
>> > There are 3 copies of MLO, 2 copies of u-boot.img, uImage and dtb in
>> the
>> > that partition.
>> >
>> > After trying multiple time flashing using dd, uImage first copy memory
>> area
>> > is corrupted and board complains the image in that partition is
>> corrupted.
>> > Now if eMMC is having controller handling wear leveling and error
>> correction
>> > mechanism then how memory area where kernel is stored is corrupted?
>> >
>> > Any suggestions/ideas/pointers to any of the mentioned problem?
>>
>> You've run into:
>>
>> CONFIG_MMC_BLOCK_MINORS=8
>>
>> Regards,
>>
>> --
>> Robert Nelson
>> https://rcn-ee.com/
>>
>
--
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