On Mon, Jul 15, 2019 at 11:09:00AM +0200, Sascha Hauer wrote: > The UBI ec_hdr has an image_seq field. During attaching UBI expects > that its value is the same for all eraseblocks. The value should be > changed with every ubiformat and is used to detect half written images. > > In barebox we use a pseudo random number generated with rand() for this > value. The ubiformat command calls srand(get_time_ns()) to initialize > the pseudo random numbber generator. This is done in the option parser, s/bb/b/ > so when ubiformat() is called directly (from fastboot for example) the > pseudo random number generator is not initialized and we get the same > values after every barebox restart. I don't understand the problem (i.e. where is srand() called up to now), but that's not important. I wonder if you could just use some data from the NAND to (additionally) initialize the rng? Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
