I'm having trouble getting the mount command to work on my desire.
Everytime I try I get this.
# mount image.img abc
mount: can't setup loop device: No such file or directory
#
Any one had any luck getting this to work?
Thanks.
what are you trying to mount?
I was trying to mount a Debian image, but then I had another idea.
If I mount a folder from sdcard onto a read only folder, ie system, I then have write access to that location (kind of), trouble is all the files have gone and everything goes tits up, so I backed up contents of system to sdcard then mounted the backup to /system, but because its a different filesystem all the permissions are lost and things go tits up again. I think what I need to do is make an image of dev/block/mtdblock3 aka system on sdcard and mount it to /system. Then I can rw in system...
Or have I got the wrong end of the stick, gone in way beyond my understanding and made myself look stupid?
Here is the kernel with yaffs2 and MTD block support, I am missing some mtd util tools like nandwrite so i cannot continue. Those that have the tools like mkyaffs2image, nandwrite, flash_eraseall can try to create an image and mount it
here are the steps that i think should work:
# mknod /dev/mtd0 c 90 0
# flash_eraseall /dev/mtd0
# mkyaffs2image /data/data yaffs2.img
# nandwrite -p /dev/mtd0 yaffs2.img
# mkdir /data/data2
# mount -t yaffs2 /dev/mtdblock0 /data/data2
If you have the tools, please attach so we can continue.. Its getting late so I am going to bed, have fun
Download
yaffs2_support.tar
Oh my god! I was just about to post similar findings, what a coincidence!
I just had compiled a kernel with yaffs2 support. My idea was to modify /init.rc in the kernel to mount the partitions with yaffs2 instead of rfs. Problem: we can't just change the filesystem without backing up and restoring all the files inside. My idea was to do that inside the recovery. Mount a mountpoint, backup with tar to /sdcard, unmount, format with dd (in theory a partition filled with 0's is ok for yaffs2), mount again with yaffs2 and restore from tar.
I'm stuck at the point that I can't seem able to mount any partition with yaffs2 previously formatted (with /system/xbin/busybox dd if=/dev/zero of=/dev/block/stl10). If I mount (/system/xbin/busybox mount -t yaffs2 /dev/block/stl10 /dbdata) there is always an "Invalid argument" error. It happens with /dev/block/stl*, /dev/block/bml* and /dev/block/mmcblk*
I'm no kernel expert, neither I know a lot about yaffs2, but I think I read you can't mount a yaffs2 partition anywhere, it has to be an MTD flash device.
Anyway, I'm going to try with the tools you said. Wish me luck.
Thanks for your work rasdeep! Is it only YAFFS2 and MTD support that you added? Because the kernel already had support for EXT2 and EXT3.
darksnarfer said:
I think I read you can't mount a yaffs2 partition anywhere, it has to be an MTD flash device.
Click to expand...
Click to collapse
Does the kernel that rasdeep posted load the existng flash devices/partitions as MTD devices?
I think as a start you only have to worry about formatting the /dev/block/mmcblk0p2 device which is mapped to the /data directory. With the new lag fix we are only moving directories stored in /data and that is what gives a big performance improvement. RyanZA did tests and found that the /dbdata partition was already quite fast and I don't think we have to worry about the /system partition etc. because we don't really write to them.
I think after a new firmware flash the /dev/block/mmcblk0p2 (mounted as /data) will be safe to format into YAFFS2 without loosing anything important.
I think these are the steps we can do:
1. Flash new firmware with repartition option on to erase everything.
2. Boot into recovery and format /dev/block/mmcblk0p2 as YAFFS2 filesystem.
3. Copy on new a init.rc script which will mount /dev/block/mmcblk0p2 to /data as a YAFFS2 filesystem and not a RFS filesytem to get much faster speeds.
bub181 said:
Does the kernel that rasdeep posted load the existng flash devices/partitions as MTD devices?
Click to expand...
Click to collapse
Just checked, there isn't any /dev/block/mtd* so I guess the kernel still can't see them as mtd.
/data is on the internal SD not in NAND so will we be able to use yaffs2 at all? I was working on formatting to EXT4 and adding the init.rc to match as well as compiling with EXT4 support, but if yaffs2 works, I'm fine with that.
modifying the init.rc is secondary because that is easy.. the main problem now is to be able to manually setup yaffs2 to mount properly.. if everything works like it should, init.rc can be change in matter of seconds
its funny now u said mtd not found.. i know we can mknod /dev/mtd* but there should be /dev/mtdblock* when booting with kernel right? hmm.. something to investigate further..
keep suggestions and finding coming, we may hit something that i've missed
problem is im lacking those tools that will do write to flash directly.. for example nandwrite.. anyone has that can share so i can try more stuff?
also, are my steps for "preparing" yaffs2 partitions/image correct? if anyone familiar with yaffs, please give some insight
raspdeep said:
modifying the init.rc is secondary because that is easy..
Click to expand...
Click to collapse
Do you need to recompile the kernel to modify the init.rc? If not could you post some instructions on how to do it please? I would like to try some things in there before /data gets mounted as a RFS filesystem.
bub181 said:
Do you need to recompile the kernel to modify the init.rc? If not could you post some instructions on how to do it please? I would like to try some things in there before /data gets mounted as a RFS filesystem.
Click to expand...
Click to collapse
i'm afraid so for now until someone found a way to extract the initramfs from later kernel and restore it back after modification..
I think it would be easier to start out with EXT2 since we can easily format that. Just as a proof of concept. I'm planning to do so tonight. Then I'll add support for EXT4 formatting and try that.
raspdeep said:
problem is im lacking those tools that will do write to flash directly.. for example nandwrite.. anyone has that can share so i can try more stuff?
Click to expand...
Click to collapse
Have you seen these pages rasdeep? They seem to describe how to create the YAFFS filesystem. Also, are there any /dev/mtdblock* devices using the kernel that you created? According to what I read elsewhere it is supposed to create both /dev/mtd* and /dev/mtdblock*. I think we have to use /dev/mtdblock* to create the new filesystem.
http://processors.wiki.ti.com/index.php/Create_a_YAFFS_Target_Image
http://processors.wiki.ti.com/index.php/MTD_Utilities
http://processors.wiki.ti.com/index.php/Put_YAFFS_Image_to_Flash
Also, I know that the Nexus One uses YAFFS2 for its internal filesystem. Maybe someone has worked out a way to write a new image file for that and we can use what they have learnt?
Can we potentially use this kernal (with the right tools) to format the NAND in YAFFS2 instead of RFS? Then still have way of flashing firmware onto it?
If so, that would be awesome and it would seem to have the least draw backs.
Currently the A2SD lag fix requires an external microsd card, and the one click lag fix, mounts a EXT2 image ontop of the RFS NAND, and that could drastically affect NAND life.
This is great !!!
Thank you raspdeep and all the devs here, this is one step closer to a stable kernel and a permanent genuine solution for the lag problem as far as a n00b like me understands
cheers !
Daemos said:
Can we potentially use this kernal (with the right tools) to format the NAND in YAFFS2 instead of RFS? Then still have way of flashing firmware onto it?
If so, that would be awesome and it would seem to have the least draw backs.
Click to expand...
Click to collapse
Not if we can't mount the NAND as a MTD-device instead of STL-device.
Daemos said:
Currently the A2SD lag fix requires an external microsd card, and the one click lag fix, mounts a EXT2 image ontop of the RFS NAND, and that could drastically affect NAND life.
Click to expand...
Click to collapse
Say what? /data/ is mounted on the internal SSD, not the NAND. /dbdata/ is however mounted on the NAND. Just do a df -h and you can see all the mountpoints.
Also, mounting and using a ext2-image that reside on an rfs-partition will not damage your drive. The rfs filesystem is still the one used to store the image itself (the ones and the zeros), even though you write it inside an image that uses another filesystem.
I stumbled upon these documents while Googling for STL-devices:
http://www.samsung.com/global/busin...y/downloads/LinuStoreII_GPL Compliance_10.pdf
http://www.samsung.com/global/busin...ionmemory/downloads/RFS_130_Porting_Guide.pdf
I haven't had the time to read them through yet. But if there's a porting guide, there must be a way to reverse it
Go go reverse engineers!
Is it really necessary to format the NAND with another filesystem? /dbdata seems fast enough as it is. Wouldn't it be enough (and easier?) to only convert the internal SD to yaffs2?
Quote from someone that knows a lot more than I do:
yaffs2 won't work on a sdcard
Click to expand...
Click to collapse
http://twitter.com/wesgarner/status/20805997718
So right now we have /data that is mounted in the second partition of the internal sdcard (mmcblk0p2), where all the critical files are stored (data, dalvik-cache, etc..) but we can't use yaffs2 there because it's not MTD.
We could, however, format and mount the other partitions (/system, /dbdata, /cache, etc...) with yaffs2, but that might not help because there isn't many heavy read/write there. And we should figure out how to make the kernel see them as /dev/block/mtdblock* instead of /dev/block/stl*.
rasdeep, can you share the .config for the kernel you used? I managed to get some mtd devices (atleast in /proc/mtd) but they were virtual devices. Maybe we need some more options enabled in the kernel.
Also, anybody knows why there are /dev/block/stl* and /dev/block/bml* they seem the same though.
darksnarfer said:
Also, anybody knows why there are /dev/block/stl* and /dev/block/bml* they seem the same though.
Click to expand...
Click to collapse
According to http://www.samsung.com/global/busin...ducts/fusionmemory/Products_XSR_Brochure.html
STL and BML are independent layers for managing I/O to the NAND devices
STL manages the sector translations while BML manages the invalid blocks (whatever that means)
Did any of you notice that in init.rc there are many references to yaffs2 ? Perhaps in engineering Samsung did use it ?
Chainfire said:
Did any of you notice that in init.rc there are many references to yaffs2 ? Perhaps in engineering Samsung did use it ?
Click to expand...
Click to collapse
Yeah, I think they are just android standard (maybe they took them from a template) and commented to use their better(?) filesystem.
darksnarfer said:
Quote from someone that knows a lot more than I do:
http://twitter.com/wesgarner/status/20805997718
So right now we have /data that is mounted in the second partition of the internal sdcard (mmcblk0p2), where all the critical files are stored (data, dalvik-cache, etc..) but we can't use yaffs2 there because it's not MTD.
We could, however, format and mount the other partitions (/system, /dbdata, /cache, etc...) with yaffs2, but that might not help because there isn't many heavy read/write there. And we should figure out how to make the kernel see them as /dev/block/mtdblock* instead of /dev/block/stl*.
rasdeep, can you share the .config for the kernel you used? I managed to get some mtd devices (atleast in /proc/mtd) but they were virtual devices. Maybe we need some more options enabled in the kernel.
Also, anybody knows why there are /dev/block/stl* and /dev/block/bml* they seem the same though.
Click to expand...
Click to collapse
Ok, so what filesystem does the internal SD use currently? Would it help if we change that to EXT4? That would emulate the current mimocan fix, but without having to use an external SD card.
Currently, the /sdcard folder is pointing to the phone memory. My external card is mounted as /sdcard/external_sd
The problem with the above structure is that all the stuff that should be stored in the actual sdcard is stored in the memory.
I am sure there is a way to mount the external sdcard as /sdcard in the system through shell commands. Can someone help me with this?
Thanks.
1. I believe you need root in order to manipulate mounting points...
2. Be careful manipulating mount points as this may break aps looking for data in the /sdcard mount point...
YMMV
Chinook Pilot said:
1. I believe you need root in order to manipulate mounting points...
2. Be careful manipulating mount points as this may break aps looking for data in the /sdcard mount point...
YMMV
Click to expand...
Click to collapse
1. I am rooted.
2. Well, I want to change the /sdcard mountpoint to the actual sdcard. I don't think this should break anything. I am not sure about the syntax, that is why I am asking.
Mount
Here's a link to the man pages for the mount command. I'm not running a stock kernel so my mount points and fstab aren't generic to the stock e4gt... Basically you need to umount both and the mount where you wish them to point... Good luck...
http://linux.die.net/man/8/mount