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<div><span></span>I have mounted JFFS2 successfully, according to the return value. </div><div>Yes, it takes some time to do the mounting work.</div>
<div><br></div><div>But, when I downloaded a file like "test.txt" into flash via FTP and restarted the system, error came up.</div><div><br></div><div><span style="color: rgb(0, 0, 0); background-color: rgba(0, 0, 0, 0);"><5>JFFS2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01FC0028: 0xE5DF instead<br><5>JFFS2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01FC002C: 0xE5DF instead<br><5>JFFS2: Further such events for this erase block will not be printed<br><5>JFFS2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01FD0000: 0x000C instead<br><5>JFFS2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01FD0004: 0xB0B1 instead<br><5>JFFS2: jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x01FD0008: 0x0054 instead<br><5>JFFS2: Cowardly refusing to erase blocks on filesystem with no valid JFFS2 nodes<br><5>JFFS2: empty_blocks 0, bad_blocks 0, c->nr_blocks 510<br>mount failed.<br></span></div><div><span style="color: rgb(0, 0, 0); background-color: rgba(0, 0, 0, 0);"><br></span></div><div><span style="color: rgb(0, 0, 0); background-color: rgba(0, 0, 0, 0);">Everything worked well, after erasing the whole flash. But errors came up without erasing it. </span></div><div><br></div><hr style="width: 210px; height: 1px;" color="#b5c4df" size="1" align="left">
<div><span><div style="MARGIN: 10px; FONT-FAMILY: verdana; FONT-SIZE: 10pt"><div>Best wishes,</div><div>xuelin.tian@qkmtech.com</div></div></span></div>
<blockquote style="margin-top: 0px; margin-bottom: 0px; margin-left: 0.5em;"><div> </div><div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style="PADDING-RIGHT: 8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b> <a href="mailto:xuelin.tian@qkmtech.com">xuelin.tian</a></div><div><b>Date:</b> 2017-10-21 22:07</div><div><b>To:</b> <a href="mailto:sebastian.huber@embedded-brains.de">Sebastian Huber</a></div><div><b>CC:</b> <a href="mailto:users@rtems.org">users</a></div><div><b>Subject:</b> Re: Filesystem in RTEMS</div></div></div><div><div class="FoxDiv20171022173417318376"><div>> 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.<br>><br>> 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.<br>> <br>> http://www.linux-mtd.infradead.org/faq/jffs2.html#L_clmarker<br><br>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. <br><br>> We have a filesystem guide:<br>> <br>> https://docs.rtems.org/branches/master/filesystem/index.html<br>><br>> Unfortunately it is out dated and incomplete. Maybe you can help to improve it.</div><div><includetail><div> </div><div>Sure, I am willing to do that, after fully understanding the file system in RTEMS.</div><div> </div><div style="font:Verdana normal 14px;color:#000;"><div style="FONT-SIZE: 12px;FONT-FAMILY: Arial Narrow;padding:2px 0 2px 0;">------------------ Original ------------------</div><div style="FONT-SIZE: 12px;background:#efefef;padding:8px;"><div id="menu_sender"><b>From: </b> "Sebastian Huber"<sebastian.huber@embedded-brains.de>;</div><div><b>Date: </b> Sat, Oct 21, 2017 06:52 PM</div><div><b>To: </b> "xuelin tian"<xuelin.tian@qkmtech.com>; <wbr></div><div><b>Cc: </b> "users"<users@rtems.org>; <wbr></div><div><b>Subject: </b> Re: Filesystem in RTEMS</div></div><div> </div><div style="position:relative;">----- Am 21. Okt 2017 um 2:17 schrieb xuelin tian xuelin.tian@qkmtech.com:<br><br>> I followed the example (testsuites/fstests/jffs2_support/fs_support.c), and some<br>> error came up, like<br>> "undefined reference to rtems_jffs2_initialize",<br>> "undefined reference to rtems_jffs2_compressor_zlib_compress", and<br>> "undefined reference to rtems_jffs2_compressor_zlib_decompress"<br>> I have no clue here. Do I have to give my own implementation of these functions<br>> here? I can exploit the default functions for jffs2 entry table and compress, I<br>> think.<br><br>In order to use JFFS2 with compression you have to add "-ljffs2 -lz" to your linker command line.<br><br>> <br>> And I have a little confused about the model of device driver in rtems, since I<br>> get stuck for a few days.<br>> First, a deivce descriptor (rtems_fdisk_device_desc) should be given, including<br>> some handlers defined in rtems_fdisk_driver_handlers, and device configuration<br>> (rtems_flashdisk_config).<br>> Then, I need to register (or initialize) my flash device into rtems dynamically<br>> or statically, with my own initialize, open, close functions.<br>> Last, the JFFS2 should be set up based on the registered device driver. The<br>> block size need to be equal to the page size of flash, and the read, write,<br>> erase operations should invoke the corresponding functions defined in<br>> rtems_fdisk_driver_handlers.<br>> <br>> Am I correct in this whoe process?<br><br>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.<br><br>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.<br><br>http://www.linux-mtd.infradead.org/faq/jffs2.html#L_clmarker<br><br>We have a filesystem guide:<br><br>https://docs.rtems.org/branches/master/filesystem/index.html<br><br>Unfortunately it is out dated and incomplete. 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