----- 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. Maybe you can help to improve it. _______________________________________________ users mailing list users@rtems.org http://lists.rtems.org/mailman/listinfo/users
