I have mounted JFFS2 successfully, according to the return value. Yes, it takes some time to do the mounting work.
But, when I downloaded a file like "test.txt" into flash via FTP and restarted the system, error came up. <5>JFFS2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01FC0028: 0xE5DF instead <5>JFFS2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01FC002C: 0xE5DF instead <5>JFFS2: Further such events for this erase block will not be printed <5>JFFS2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01FD0000: 0x000C instead <5>JFFS2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01FD0004: 0xB0B1 instead <5>JFFS2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01FD0008: 0x0054 instead <5>JFFS2: Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes <5>JFFS2: empty_blocks 0, bad_blocks 0, c->nr_blocks 510 mount failed. Everything worked well, after erasing the whole flash. But errors came up without erasing it. Best wishes, xuelin.t...@qkmtech.com From: xuelin.tian Date: 2017-10-21 22:07 To: Sebastian Huber CC: users Subject: Re: Filesystem in RTEMS > There is no general purpose flash framework in RTEMS (like MTD on Linux). The > JFFS2 uses therefore a framework independent interface. You have to provide > functions for the basic flash operations read, program and erase > yourself. > You should test these operations separately. > > The first mount of JFFS2 on a completely erased flash may take a while since > it is erased block by block and then the clean markers are programmed. > > http://www.linux-mtd.infradead.org/faq/jffs2.html#L_clmarker I have already tested my flash operations, they all worked well. Now, I use the same handle (an instance based on Xilinx BSP) to access to the hardware. And I just have one little question here, what is the appropriate block size for the JFFS2? The size of page is 256B, and size of segment is either 4KB or 64KB. > We have a filesystem guide: > > https://docs.rtems.org/branches/master/filesystem/index.html > > Unfortunately it is out dated and incomplete. Maybe you can help to improve > it. Sure, I am willing to do that, after fully understanding the file system in RTEMS. ------------------ Original ------------------ From: "Sebastian Huber"<sebastian.hu...@embedded-brains.de>; Date: Sat, Oct 21, 2017 06:52 PM To: "xuelin tian"<xuelin.t...@qkmtech.com>; Cc: "users"<users@rtems.org>; Subject: Re: Filesystem in RTEMS ----- Am 21. Okt 2017 um 2:17 schrieb xuelin tian xuelin.t...@qkmtech.com: > I followed the example (testsuites/fstests/jffs2_support/fs_support.c), and > some > error came up, like > "undefined reference to rtems_jffs2_initialize", > "undefined reference to rtems_jffs2_compressor_zlib_compress", and > "undefined reference to rtems_jffs2_compressor_zlib_decompress" > I have no clue here. Do I have to give my own implementation of these > functions > here? I can exploit the default functions for jffs2 entry table and compress, > I > think. In order to use JFFS2 with compression you have to add "-ljffs2 -lz" to your linker command line. > > And I have a little confused about the model of device driver in rtems, since > I > get stuck for a few days. > First, a deivce descriptor (rtems_fdisk_device_desc) should be given, > including > some handlers defined in rtems_fdisk_driver_handlers, and device > configuration > (rtems_flashdisk_config). > Then, I need to register (or initialize) my flash device into rtems > dynamically > or statically, with my own initialize, open, close functions. > Last, the JFFS2 should be set up based on the registered device driver. The > block size need to be equal to the page size of flash, and the read, write, > erase operations should invoke the corresponding functions defined in > rtems_fdisk_driver_handlers. > > Am I correct in this whoe process? There is no general purpose flash framework in RTEMS (like MTD on Linux). The JFFS2 uses therefore a framework independent interface. You have to provide functions for the basic flash operations read, program and erase yourself. You should test these operations separately. The first mount of JFFS2 on a completely erased flash may take a while since it is erased block by block and then the clean markers are programmed. http://www.linux-mtd.infradead.org/faq/jffs2.html#L_clmarker We have a filesystem guide: https://docs.rtems.org/branches/master/filesystem/index.html Unfortunately it is out dated and incomplete. 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