Hi,<div><br></div><div>I&#39;m trying to mount a YAFFS partition in u-boot so that I can read/write files that are in an existing YAFFS partition created with linux.</div><div>I&#39;ve built u-boot v2012.10 with som very minor changes to support our embedded linux board (similar to at91sam9260ek).</div>
<div><br></div><div>From linux I have the following partitions</div><div><br></div><div><div># cat /proc/mtd</div><div>dev:    size   erasesize  name</div><div>mtd0: 00040000 00020000 &quot;uboot-env0&quot;</div><div>mtd1: 00040000 00020000 &quot;uboot-env1&quot;</div>
<div>mtd2: 00400000 00020000 &quot;kernel0&quot;</div><div>mtd3: 00400000 00020000 &quot;kernel1&quot;</div><div>mtd4: 01400000 00020000 &quot;rootfs0&quot;</div><div>mtd5: 01400000 00020000 &quot;rootfs1&quot;</div><div>
mtd6: 1cf00000 00020000 &quot;user&quot;</div><div>mtd7: 00020000 00020000 &quot;bootstrap&quot;</div><div>mtd8: 00060000 00020000 &quot;uboot&quot;</div></div><div><br></div><div># cat /proc/mounts</div><div><div>rootfs / rootfs rw 0 0</div>
<div>/dev/root / yaffs2 rw,relatime 0 0</div><div>devtmpfs /dev devtmpfs rw,relatime,size=14148k,nr_inodes=3537,mode=755 0 0</div><div>proc /proc proc rw,relatime 0 0</div><div>devpts /dev/pts devpts rw,relatime,gid=5,mode=620 0 0</div>
<div>tmpfs /dev/shm tmpfs rw,relatime,mode=777 0 0</div><div>tmpfs /tmp tmpfs rw,relatime 0 0</div><div>sysfs /sys sysfs rw,relatime 0 0</div><div>none /proc/bus/usb usbfs rw,relatime 0 0</div><div>/dev/mtdblock6 /mnt/flash yaffs2 rw,relatime 0 0</div>
</div><div><br></div><div>Where the MTD partitions are defined in the linux borad file as:</div><div><br></div><div><div>static struct mtd_partition __initdata exyp_nand_partition[] = {    </div><div>        {</div><div>                .name   = &quot;uboot-env0&quot;,</div>
<div>                .offset = 0x00080000,</div><div>                .size   = 0x00040000,  /* two erase blocks (256kB) */</div><div>        },</div><div>        {</div><div>                .name   = &quot;uboot-env1&quot;,</div>
<div>                .offset = 0x000C0000,</div><div>                .size   = 0x00040000,  /* two erase blocks (256kB) */</div><div>        },</div><div>        {</div><div>                .name   = &quot;kernel0&quot;,</div>
<div>                .offset = 0x00100000,</div><div>                .size   = 0x00400000,  /* 4MB */</div><div>        },</div><div>        {</div><div>                .name   = &quot;kernel1&quot;,</div><div>                .offset = 0x00500000,</div>
<div>                .size   = 0x00400000,  /* 4MB */ </div><div>        },</div><div>        {</div><div>                .name   = &quot;rootfs0&quot;,</div><div>                .offset = 0x00900000,</div><div>                .size   = 0x01400000,  /* 20MB */</div>
<div>        },</div><div>        {</div><div>                .name   = &quot;rootfs1&quot;,</div><div>                .offset = 0x01D00000,</div><div>                .size   = 0x01400000,  /* 20MB */</div><div>        },</div>
<div>        {</div><div>                .name   = &quot;user&quot;,</div><div>                .offset = 0x03100000,</div><div>                .size   = 0x1cf00000,  /* 463MB */</div><div>        },</div><div>        {</div>
<div>                .name   = &quot;bootstrap&quot;,</div><div>                .offset = 0,</div><div>                .size   = 0x00020000,  /* one erase block (128kB) */</div><div>        },</div><div>        {</div><div>
                .name   = &quot;uboot&quot;,</div><div>                .offset = 0x00020000,</div><div>                .size   = 0x00060000, /* three erase blocks (384kB) */</div><div>        }, </div><div>    </div><div>
};</div></div><div><br></div><div><br></div><div>Both rootfs and user MTD partitions are formatted YAFFS with file content.</div><div><br></div><div>When I try to access the yaffs file systems from u-boot I can mount them but they are empty.</div>
<div>I can store files to the and make directories etc but I get no access to the existing files in the partitions created within linux and the files disappear after a reboot.</div><div><br></div><div><div>U-Boot&gt; version</div>
<div><br></div><div>U-Boot 2012.10 (Nov 15 2012 - 11:10:15)</div><div>arm-linux-gcc (Buildroot 2011.11-svn407) 4.3.6</div><div>GNU ld (GNU Binutils) 2.21.1</div></div><div><br></div><div><div>U-Boot&gt; nand info</div><div>
<br></div><div>Device 0: nand0, sector size 128 KiB</div><div>  Page size      2048 b</div><div>  OOB size         64 b</div><div>  Erase size   131072 b</div></div><div><br></div><div><div>U-Boot&gt; ydevconfig user 0 0x188 0xfff</div>
<div>Configures yaffs mount user: dev 0 start block 392, end block 4095</div></div><div><br></div><div><div>U-Boot&gt; ydevconfig rootfs 0 0xe8 0x187</div><div>Configures yaffs mount rootfs: dev 0 start block 232, end block 391</div>
</div><div><br></div><div><div>U-Boot&gt; ydevls</div><div>rootfs         0 0x000e8 0x00187 not mounted</div><div>user           0 0x00188 0x00fff not mounted</div></div><div><br></div><div><div>U-Boot&gt; ymount user</div>
<div>Mounting yaffs2 mount point user</div><div>U-Boot&gt; ymount rootfs</div><div>Mounting yaffs2 mount point rootfs</div><div>U-Boot&gt; yls rootfs</div><div>lost+found</div><div>U-Boot&gt; yls user</div><div>lost+found</div>
</div><div><br></div><div><div>U-Boot&gt; ywr user/foo 0x55 10</div><div>Writing value (55) 10 times to user/foo... done</div></div><div><br></div><div><div>U-Boot&gt; yls user</div><div>foo</div><div>lost+found</div></div>
<div><br></div><div>&lt;REBOOT&gt;</div><div><br></div><div><div>U-Boot&gt; ydevconfig user 0 0x188 0xfff</div><div>Configures yaffs mount user: dev 0 start block 392, end block 4095</div><div>U-Boot&gt; ymount user</div>
<div>Mounting yaffs2 mount point user</div><div>U-Boot&gt; yls user</div><div>lost+found</div></div><div><br></div><div><br></div><div>It seems that YAFFS is mounting on top of RAM instead of on the NAND chip.</div><div>Do I have to specify mtd parts in u-boot order to access the NAND?</div>
<div>Is there a u-boot config define for selecting NAND or RAM for YAFFS2 support?</div><div><br></div><div>My ultimate goal is to read out the linux kernel image from the rootfs (YAFFS), copy it to RAM and boot.</div><div>
<br></div><div>Michel</div><div><br></div>