On 02/06/2012 04:23 PM, Albert ARIBAUD wrote: > Hi Vaibhav, > > Le 06/02/2012 05:57, vaibhav kothari a écrit : >> hi albert >> >> Yes,actually there is already support of flash test in POST of latest >> uboot.They are testing flash on every power on so am I for my board.But i >> don't want to disturb sectors in which uboot code relies. Can you help me >> here? > > I am no NAND specialist, but I do hope NAND POST tests are pure read > tests and thus are not affected by poweroffs (and can actually test any > part of NAND).
NAND has a property called "read disturb", where excessively reading a sector without writing to it can eventually cause data loss. U-Boot is already read once per boot, but reading it a second time could halve the expected lifetime. Data managed by something like ubi is be scrubbed in a way that avoids this, but U-Boot itself is not usually managed in this way (boot hardware/rom does not understand ubi). -Scott _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
