[Oberon] Oberon] FPGA - Save / Restore OBERON.FS
thomas.kral at email.cz
Wed Apr 19 13:03:50 CEST 2017
Now I realised I am not certain how big Oberon FS really is, is it 64MB
Also my problem always seem, as do we start counting from `0' or `1'. Is
the counting index offset +1 -1 or 0?
Do we count centuries, epochs from 0 or 1, what was at the beginning,
year 0, or year 1?
On Fri, 14 Apr 2017 14:09:36 +0000
eas lab <lab.eas at gmail.com> wrote:
> $ dd -h
> BusyBox v1.24.2 (2016-05-16 13:28:30 UTC) multi-call binary.
> Usage: dd [if=FILE] [of=FILE] [ibs=N] [obs=N] [bs=N] [count=N]
> [skip=N] [seek=N] [conv=notrunc|noerror|sync|fsync]
> ls -l OBERON1.FS
> to confirm the existence of OBERON1.FS in THAT directory
> [don't call it a folder like office-girls do] Follow this
> example:- Make a file of few bytes:
> echo "What count should I use?" > SmallTextFile
> See what the size is: ls -l SmallTextFile
> -rw-r--r-- 1 tc staff 25 Apr 14 15:17 SmallTextFile
> See the individual bytes, of totol 25, that you want to cut-off:
> cat SmallTextFile | hexdump -C
> 00000000 57 68 61 74 20 63 6f 75 6e 74 20 73 68 6f 75 6c |What
> count shoul| 00000010 64 20 49 20 75 73 65 3f
> 0a |d I use?.| This is an example of
> piping/functional-programming, that I have been, and will continue to
> Let's cut off the 1st 5chars and the tail to get only the 5chars of
> "count"; dd if=SmallTextFile of=SmallERTextFile skip=5 count=5
> transfers 0 bytes; perhaps because the default <BlockSize> is 512,
> but then why the previous write-25-bytes?
> dd if=SmallTextFile of=SmallERTextFile bs=1 skip=5 count=5
> cat SmallERTextFile | hexdump -C
> 00000000 63 6f 75 6e 74 |count|
> I didn't mention possible <sudo problems>.
> $ dd if=/dev/sdc of=OBERON1.FS bs=1024 skip=262145 count=$((65*1024))
> That's one-line, including count=$((65*1024)),
> but I'm not sure that the <64K> will be correctly handled.
> Best confirm by the simplest method, before starting to optimise.
> Oh!! Shouldn't it have been 64*1024 ?!
> On 4/13/17, Tomas Kral <thomas.kral at email.cz> wrote:
> > Hi,
> > EDIT, at the end
> > Reading some earlier post by Paul Read, I look for `dd' syntax to
> > save and restore my work on uSD card.
> > Providing
> > uSD card is formatted as 256MB FAT + 65MB OBERON.
> > Restore my work indexed as `1' may work like this,
> > $ dd if=OBERON1.FS of=/dev/sdc bs=1024 seek=262145
> > By how about saving the work first,
> > $ dd if=/dev/sdc of=OBERON1.FS bs=1024 skip=262145 count=???
> > What count should I use?
> > `System.Watch' may give a clue, but does not seem exact.
> > EDIT, correction
> > I could also use a fixed value of the whole 65MB Oberon partition,
> > but not sure if below is correct
> > $ dd if=/dev/sdc of=OBERON1.FS bs=1024 skip=262145
> > count=$((65*1024))
> > Reading `dd' manual, allows for suffixes,
> > $ dd if=/dev/sdc of=OBERON1.FS bs=1K skip=265M
> > count=65M
> > Correct?
> > Many thanks.
> > Tomas
> > --
> > Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related
> > systems https://lists.inf.ethz.ch/mailman/listinfo/oberon
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related
> systems https://lists.inf.ethz.ch/mailman/listinfo/oberon
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