[Oberon] FPGA - Save / Restore OBERON.FS

Felix Friedrich felix.friedrich at inf.ethz.ch
Thu Apr 20 14:52:06 CEST 2017


In A2 / Blubottle (and Minos/HeliOS) the conceptual OberonFS file system 
size limitation is 8-16 TB with sector/block size of 4K (16 TB if 
unsigned operations are implemented correctly, otherwise using signed 
longints it is 8 TB).
Upper file size limit is 4 GB; more presizely it is 4 GiB + 1 MiB + 3528 
B: a File entry comprises 3528 Bytes of data, 128 pointers to data block 
and 1 pointer to a doubly indirect index block, the rest is metadata 
(such as filename, mark bit, ...)


> On 20 April 2017 at 05:42, Skulski, Wojciech <skulski at pas.rochester.edu> wrote:
>> My biggest concern about Oeron FS is its limited size.
> Is this still true in the A2/Bluebottle OS?
> I am a little surprised that nobody on this list seems to even mention that...

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