[...] > > ROM when loading firmware, copies back > > the value at metadata[0] to BI offset in page data. The following figure > > shows how the factory bad block marker is preserved. > > ...this is insane. It seems that they want you to swap this byte even > in good blocks, so that you put the byte of real data that should go > somewhere in the middle of the last 512-byte ECC chunk at offset zero in > the page. This means that it will show up as a bad block when normal > (but new-layout-using) software looks at it, which is why you need > scrub. Ew. > > How many blocks are being loaded by this mechanism? Just block zero > (which is normally supposed to be guaranteed good anyway...)? Or > multiple blocks?
The first block, then the 64th block, 128th block and 192th block (in default layout). > > Any chance you could blow the NAND_MEMBLOCK_MARKER_RESERVE fuse? :-) No, they are one-time programable. Delivering a "damaged" chip isn't a good practice. > Otherwise, I guess you do need to scrub. Have you complained to > Freescale sales/support? In fact no. The BootROM is "broken" and I doubt they will be willing to do anything about it. > > > But we want to write a block in our own format, so we need to scrub (wipe > > the block completely). > > Erase always wipes the block completely, if it erases at all. Scrub in > this context just means that U-Boot ignores the bad block indications > (marker or table). Otherwise it would avoid erasing bad blocks, so that > they stay bad, and you won't have scrubbed the entire region requested. > > >> I work for the PowerPC side of Freescale, in case you're wondering why > >> I'm unfamiliar with this. :-) > > > > Interesting ... does everyone work for the PowerPC side of Freescale or > > is there some other reason why I never met anyone working for the ARM > > side of Freescale ? ;-) > > They exist, but don't seem to engage Open Source development communities > to the same degree. > > -Scott Cheers _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
