Honored ContributorI would like to use jffs2 with ecos on the cycloneII NIOSII development board.
I have included jffs2 into the ecos lib. Now I don't know what to do next - I have looked for some documentation but could not find it in the ecos directories. Any help on getting started would be great. Thanks
Honored ContributorYou can find example code that uses jffs2 in the tests directory of the jffs2 package. Limited documentation, and links to the jffs2 mailing lists, can be found here (http://sources.redhat.com/jffs2/).
Honored ContributorHi pxs,
> Now I don't know what to do next 1. create a jffs2 filesystem You can create a filesystem image with mkfs.jffs2 and download it to your jffs2 partition. As an alternative, you can simply erase your jffs2 partition. 2. mount the partition You can mount the partition in cycuser_start(). For example:void cyg_user_start(void)
{
...
# ifdef CYGPKG_IO_FILEIO
if (mount ("/dev/flash1", "/", "jffs2") == 0)
chdir ("/");# endif
...
}ret = mkdir ("newdir", S_IRWXU|S_IRWXG|S_IRWXO); /* Create a directory */
ret = rmdir ("olddir"); /* Remove a directory */
ret = rename ("oldname", "newname"); /* Rename a file */
/* ... and so on ... */>1. create a jffs2 filesystem
>You can create a filesystem image with mkfs.jffs2 and download it to your jffs2 partition. >As an alternative, you can simply erase your jffs2 partition. The only time I used mkfs.jffs2 was on an uClinux box and it had mkfs.jffs2 on it. So I created the directory structure in RAM and then ran mkfs.jffs2 on the uClinux box and it created the image. I then used erase and copied the image over. Then I used mount. Can you explain how you create the image in more detail? Do you use a Linux box to create it or do you download the source and compile it on a windows box using cygwin, or do you compile it in NIOS? How do I download it to the jffs2 partition? How do I create the jffs2 partition? Do I need Redboot? ThanksHonored ContributorHi pxs,
> Can you explain how you create the image in more detail? 1. In your unix environment create a directory that will serve as the root of your jffs2 filesystem. 2. Then populate this directory with all of the directories, files, links, etc. that are needed for your target system. 3. Run mkfs.jffs2, specifying the directory you created in step 1 (the -r, -d, or --root option). You'll need to specify the eraseblock size also. A single 8-bit device with 64K sector size would be "-e 0x10000", two of them in parallel would be "-e 0x20000" and so on. It's also a good idea to explicitly set the endian order in your makefiles as a precaution, use -l option for nios. By default mkfs.jffs2 will use the endian order of the machine you run it on (for nios and x86 this is never a problem since they're both little endian -- but PowerPC hosts can cause issues). So an invocation of mkfs.jffs2 might look something like this if your file structure is in the directory "ecos_root":$ mkfs.jffs2 -d ecos_root -e 0x10000 -o jffs2.bin -lHi pxs,
Just FYI ... > I haven't tried these sources with the latest 5.0 stuff yet. I was able to finish installing the Microtronix linux uClinux for Nios II 5.0, and the psyent sources for mkfs.jffs2, mkcramfs, etc. build just fine in the Nios SDK shell environment ... they also build fine under RH9. Regards, --ScottHonored ContributorThanks Scott,
I have downloaded Microtronix linux uClinux for Nios II 5.0 and compiled mkfs.jffs2 without a problem. I created a few directories and a file and then I used the following command to generated jffs2.img$> mkfs.jffs2 -d jffs2 -e 0x10000 -o jffs2.img -l$> bin2flash --input=jffs2.img --base=0x0000 0000 --location=0x0060 0000 --verbose$> nios2-flash-programmer --base=0x0000 0000 --input=jffs2.flash --location=0x0060 0000 --verbose --sof=/cygdrive/c/altera/kits/nios2/examples/verilog/niosII_cycloneII_2c35/standard/standard.sofHi pxs,
> I placed it high in the user region but I am not sure where ecos is placed - do you > know where I can find this information? ecos is normally stored at the reset address ... so it will start at power-on or cpu reset. You can check your elf file with objdump: $ nios2-elf-objdump -h your-ecos-elf-file > I then tried to download jffs2.flash to the board with the following command without succuss. <div class='quotetop'>QUOTE </div> --- Quote Start --- $> nios2-flash-programmer --base=0x0000 0000 --input=jffs2.flash --location=0x0060 0000 --verbose --sof=/cygdrive/c/altera/kits/nios2/examples/verilog/niosii_cycloneii_2c35/standard/standard.sof[/b] --- Quote End --- You need to specify the _programmer_ sof for the board ... not the example configuration. Use the sof in: $SOPC_KIT_NIOS2/components/altera_nios_dev_board_cyclone_2c35/system/altera_nios_dev_board_cyclone_2c35.sof > Can you explain further about how to make the jffs2 partition you spoke of previously (see below). > Is this the jffs2.img (jffs2.flash) or do I have to do something to make the partition? You can divide your flash into several "blocks" or "areas" that can be independently managed by jffs2 ... all in the same spirit as partitions on a hard disk drive. So from a software point-of-view, it appears as though you have multiple flash "drives". Since I'm primarily a linux person, I've never used more than a single partition with ecos ... but I'm assuming there's an easy way to create more than one with the config tool. Maybe monkeyboy can help with this. Regardless, you can configure your default partition in the "Flash device drivers" configuration under "instantiate in I/O block device API" -> "static configuration". Regards, --Scott
