> -----Original Message----- > From: barebox-bounces@xxxxxxxxxxxxxxxxxxx [mailto:barebox- > bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Vanalme Filip > Sent: vrijdag 25 februari 2011 14:50 > To: barebox@xxxxxxxxxxxxxxxxxxx > Subject: writing environment in NAND flash > > I have problems to save my environment settings. Although I set e.g. the MAC > address and some other values and do the saveenv command, after reset, all > settings have disappeared. > In the logging on the console port, I detected this : > "wrong crc on env > no valid environment found on /dev/env0. Using default environment" > > That will be, of course, the cause why the settings disappear. > Further investigation with debugging enabled in nand_imx.c showed that Barebox > reads 4 pages when starting up (0x80..0x83). That looks OK, because the > environment's size is 6156 bytes. So, indeen 4 pages needed. However, when > saving the environment, I only see appear one page write, i.e. on page 0x80. Of > course, when reading back the four pages, the 2nd, 3rd and 4th page have all FF > because they have never been written (causing a wrong CRC). Any idea why I > only see 1 page write when saving the environment although the size is 6156 > bytes ? Any hints where to look in the sources ? > > Thanks in advance ! > > > > Filip > [Filip] Sorry for sending this message twice to the mailing list.... I have found the cause of this problem. I have CONFIG_MTD_NAND_VERIFY_WRITE=y. So, after a write, the code performs a read to verify the written data. For i.MX27, this mean that the function imx_nand_very_buf() is called. Well, that function looks like this : static int imx_nand_verify_buf (struct mtd_info *mtd, const u_char * buf, int len) { return -EFAULT; } Yep...verification always fails... ! Must be a function that still is under development, no ? (although I would have expected a "TODO" somewhere in that function....). Two things I can do : set the configuration flag to n or add code to this function to really verify the written data. > _______________________________________________ > barebox mailing list > barebox@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/barebox _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
