[Oberon] Oberon] FPGA - Save / Restore OBERON.FS

[eas lab]

$ 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]
--------------------
Do:
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 harp-on-about!

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
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