On Wed, Mar 8, 2017 at 3:19 AM, Denis Periša <darkman...@gmail.com> wrote: >>> Just curious, this bad sectors appeared during regular device >>> operation or just after sysupgrade? > > > Sysupgrade. I had to get to roof and replace device as I could no > longer get firmware on it. Btw. I wrote that it would be nice to first > check nand than write if possible.
Before sysupgrade starts checking NAND it should know target flash type, but image does not contain this info now. Image name contains tiny hint: "64m" is for chips with 512-bytes pages and "large" is for chips with 2048-bytes pages. Your flash type could be revealed by: # dmesg | grep "page size" > sysupgrade told me that firmware > was flashed successfully but on reboot no kernel was found. > Yep. sysupgrade uses nandwrite utility, which could only report data write result but could not predict kernel reaction to such "data". >>> I am asking because it could be "false positive" bad sectors. Couple >>> of weeks ago I flash one rb411 with wrong image. I used image for >>> flash chips with 512-bytes pages, while the board was equipped with >>> flash chip with 2048-bytes pages. And after reboot kernel printed a >>> lot of "bad sector" messages. Actually sectors was fine, but using of >>> the wrong firmware image lead to corruption of OOB data of several >>> pages. >>> >>> I solved this issue by flashing back the vendor's firmware with help >>> of netinstall, this action had recover flash OOB. Then I flash the >>> device again, but now with the correct LEDE image and it works! Looks >>> like that the similar results could be reached with _nandwrite_ >>> utility, but I did not try it. > > You might be on to something there, I had same device and it was brand > new out of box.. Flashed firmware once, flashed twice, lot more bad > sectors, next time whole nand was bad. That time I experimented with > yaffs1 and yaffs2, had lot of issues there. Returned it as RMA same > day, got another device. I actually tried to find how I could from > linux re-detect or re-check how to put it, those bad sectors but > didn't find any info. This yours is very helpful info, I'll try that > and return here, but question stays, maybe in future some NANDs will > begin to fail. This could be helpful in future. > Even 2Mb kernel partition contains enough spare space to overcome rise of few bad sectors. To get more bad sectors you should reflash your board a couple of time per day for several years. So IMHO there are nothing to worry about. -- Sergey _______________________________________________ Lede-dev mailing list Lede-dev@lists.infradead.org http://lists.infradead.org/mailman/listinfo/lede-dev
