On 1 May 2015 at 01:13, Marek Vasut <ma...@denx.de> wrote: > On Thursday, April 30, 2015 at 11:13:12 PM, Michal Suchanek wrote: >> The sector size of the flash memory is unclear from datasheet or may >> possibly vary between chips so add a flag to always use 4k blocks. >> >> Currently 4k blocks are always used when possible but in the future >> somebody might want to do some optimizations with sector erase. >> >> Signed-off-by: Michal Suchanek <hramr...@gmail.com> > > I _think_ you might be able to determine the size, no ? > > One way is to ask the vendor, but you can also try something like: > 1) erase the whole SPI NOR > 2) overwrite it with zeroes (or ones ? I think it should be all ones after > erasing). > 3) Erase sector 0 > 4) Read some 128 KiB back > 5) Observe what is the difference. >
I can determine it for this particular chip. However, when the vendor datasheet says the block is 64/32K it might mean that chips with this ID can have either block size. It's a value that we don't use anyway so I just mark it as unknown here for future reference. Thanks Michal -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/