Re: NanoNote debootstrap debugging
On Friday 26 March 2010 17:06:12 Phil Endecott wrote:
> Florian Fainelli wrote:
> > On Friday 26 March 2010 16:51:15 Phil Endecott wrote:
> >> Florian Fainelli wrote:
> >> > On Friday 26 March 2010 13:06:01 Phil Endecott wrote:
> >> >> yajin wrote:
> >> >> > The nano note's CPU does NOT have a fp. So it needs the kernel to
> >> >> > emulate the fp instruction.
> >> >>
> >> >> OK, thanks. But presumably the OpenWRT kernel is already doing that
> >> >> because the OpenWRT binaries run. Is there more than one FP
> >> >> emulation mode, or something? (Any docs about this?)
> >> >
> >> > The OpenWrt kernel disables the in-kernel FPU emulator and produces
> >> > software- floating point toolchains (-msoft-float).
> >>
> >> Thanks, I guessed it would be something like that. So presumably I
> >> need to build a kernel (which is not fundamentally difficult, but I was
> >> hoping to avoid having to make a cross-toolchain) - unless there is a
> >> pre-built kernel somewhere that might work for this device?
> >
> > There are OpenWrt binaries for this device pre-built [1], but they
> > include the kernel plus rootfilesystem, so you might want to compile a
> > kernel of your own with the in-kernel FPU emulator turned on.
> >
> > [1]: http://downloads.openwrt.org/snapshots/trunk/xburst/
>
> Are you saying that those packages have a kernel with FP emulation
> switched on, so that they will work with the Debian mips binaries?
All the *.ipk files were compiled with software floating point, so they will run
fine with a kernel which has FPU emulator on or off. However, the kernel
provided [1] does not have the FPU emulator turned on.
[1]: http://downloads.openwrt.org/snapshots/trunk/xburst/openwrt-xburst-
uImage.bin
--
Florian
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