Hi Matt, guys, I'm experiencing troubles implementing Minix filesystem over sd card. For some reason I can't find, reading a big file (64MB) always gets stuck at the exact same location.
I can't dive into Minix internals here, but filesystem is divided into 1KB block. Addresses where data actually lies are located on zones. When files is becoming large, you need to read some indirect data addresses (and even double indirect). So, when reading content, block addresses are read like this: block 0x3250 => 1KB data block 0x3251 => 1KB data block 0x3252 => 1KB data ... then nothing :( Digging this, I discovered the data location address isn't 0x3253 as expected (I checked with hexdump, this is the next data location for sure), but, instead, it is 0x3253FEFF ! This means while reading address on sd card, it seems some sd card internal bytes were returned, instead of actual data (0xFE and 0xFF are some kind of meaningful internal bytes IIUC). Does this make sense to you ? I really can't figure out why it occurs at this time. And it is always, strictly always the same location. TIA Cheers, Seb 2011/4/21 Sebastien Lelong <[email protected]> > Hum... I didn't realize this difference... > > :) > > Seb > > > 2011/4/21 Oliver Seitz <[email protected]> > >> >> > I perfer the RAM due to fast >> > read/write speeds, high endurance. Does >> > SST have any serial ram? What is the write speed of SST >> > flash? >> >> I was about to write that... But then I realized that both chips were pin >> compatible, so the PCB would work with ram or flash ;-) >> >> Greets, >> Kiste >> >> -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
