I'm looking into running uClinux on a
Microblaze.. and I read that
Microblaze alone uses up about 900 logic cells...  not sure how many
gates that equates to, but anyone venture a guess if a Spartan II
(150k gates) with 16MB of RAM, 4MB Flash is enough to run uClinux?

On 5 sept, 00:05, benn
<benn...@hotmail.com> wrote:
> I'm looking into running uClinux on a Microblaze.. and I read that
> Microblaze alone uses up about 900 logic cells... =A0not sure how many
> gates that equates to, but anyone venture a guess if a Spartan II
> (150k gates) with 16MB of RAM, 4MB Flash is enough to run uClinux?

requirements (absolute minimal)
MB-uClinux
*microblaze
*intc
*timer
*uartlite
* 4M RAM (maybe 2 or even 1)

MB + small (minimal) system does fit s2-150
but 16MB sounds like SDRAM so you need sdram controller ip as well
if that together fits s2-150 i bet it is gonna be very tight

Antti

On Sep 4, 5:05=A0pm, benn
<benn...@hotmail.com> wrote:
> I'm looking into running uClinux on a Microblaze.. and I read that
> Microblaze alone uses up about 900 logic cells... =A0not sure how many
> gates that equates to, but anyone venture a guess if a Spartan II
> (150k gates) with 16MB of RAM, 4MB Flash is enough to run uClinux?

If you know how many logic cells the Microblaze uses, why don't you
just look at how many logic cells your FPGAs have???  Gate count is a
level removed from reality both in the design and in the chip.  So why
translate into the domain of a poor measurement?

Rick

On 5 sept, 15:53, rickman
<gnu...@gmail.com> wrote:
> On Sep 4, 5:05=A0pm, benn <benn...@hotmail.com> wrote:
>
> > I'm looking into running uClinux on a Microblaze.. and I read that
> > Microblaze alone uses up about 900 logic cells... =A0not sure how many
> > gates that equates to, but anyone venture a guess if a Spartan II
> > (150k gates) with 16MB of RAM, 4MB Flash is enough to run uClinux?
>
> If you know how many logic cells the Microblaze uses, why don't you
> just look at how many logic cells your FPGAs have??? =A0Gate count is a
> level removed from reality both in the design and in the chip. =A0So why
> translate into the domain of a poor measurement?
>
> Rick

the gate count is sure ir relevant
but the MB LC count is also :)

he needs to build the system and check it out
and change options to optimize
this can not be calculated from datasheets

Antti

On Sep 5, 9:56=A0am, Antti
<Antti.Luk...@googlemail.com> wrote:
> On 5 sept, 15:53, rickman <gnu...@gmail.com> wrote:
>
> > On Sep 4, 5:05=A0pm, benn <benn...@hotmail.com> wrote:
>
> > > I'm looking into running uClinux on a Microblaze.. and I read that
> > > Microblaze alone uses up about 900 logic cells... =A0not sure how man=
y
> > > gates that equates to, but anyone venture a guess if a Spartan II
> > > (150k gates) with 16MB of RAM, 4MB Flash is enough to run uClinux?
>
> > If you know how many logic cells the Microblaze uses, why don't you
> > just look at how many logic cells your FPGAs have??? =A0Gate count is a
> > level removed from reality both in the design and in the chip. =A0So wh=
y
> > translate into the domain of a poor measurement?
>
> > Rick
>
> the gate count is sure ir relevant
> but the MB LC count is also :)
>
> he needs to build the system and check it out
> and change options to optimize
> this can not be calculated from datasheets

Of course.  The only way to measure the LC count of a design is to
build it.  But you can't determine the size of a chip by the data
sheets either.  Xilinx routinely inflates the LC count in their data
sheets.  Of course, they claim that there is no physical entity called
a Logic Cell (LC) so they can count them any way they choose!  In
reality, the rest of us consider an LC to be the pairing of a 4 input
LUT and a FF.  The vast majority of designs use more LUTs than FFs, so
you can actually simplify this to the count of 4 input LUTs.

Rick

On Sep 4, 2:05=A0pm, benn
<benn...@hotmail.com> wrote:
> I'm looking into running uClinux on a Microblaze.. and I read that
> Microblaze alone uses up about 900 logic cells... =A0not sure how many
> gates that equates to, but anyone venture a guess if a Spartan II
> (150k gates) with 16MB of RAM, 4MB Flash is enough to run uClinux?

I'd guess "no".  MicroBlaze hasn't been supported in the Spartan-II
since EDK-6.3.