Hi, Yes I see FP problems. I reported it to Technologics back in October
last year, and Jesse said he'd take a look if he had time. To be honest
it's not been a show stopper for me 'cos I tend to try and use integer or
my own fixed point stuff. However busybox uses floats occasionally (e.g.
in it's version of "top") and my recompiled busybox "top" gives crazy
numbers at times :-(
Sorry for only posting an AOL "me too" and not being able to offer any
help.
Jim
On Sun, 27 Mar 2005, genosensor wrote:
>
>
> Has anyone else tried running applications use floating
> point under the minimal JFFS2 Linux distro supplied with
> the TS-7200?
>
> I've been unable to get much of any non-trival floating
> point operations work in this environment, even using the
> compiler toolchain binaries provided on the CDROM.
>
> I'd be very grateful if a few people could run this test
> program on their TS-7200's can get back to me.
>
> Remember, it works fine under Debian. Boot from the
> JFFS2 image to see the failures. If anyone _can_ get this
> to work in that environment, _please_ do tell me all
> about your toolchain and/or any other relevant voodoo.
>
> Thanks :-)
>
> I build with:
>
> $ /arm/bin/gcc -o fptest -lm fptest.c
>
> Substitute the path to your arm gcc for /arm/bin/gcc
>
> On the TS-7200, run it with:
>
> $ fptest -4.3
>
> The correct output follows.
> Note that under the JFFS2 image, a few of the
> functions return bogus results and the exp() fn usually
> causes a segfault.
>
>
> atof(-4.3) = -4.3 = 33 33 11 c0 33 33 33 33
> sscanf(-4.3, "%f", &f) assigns f = -4.3 = 9a 99 89 c0
> (int)-4.3 = -4 = fc ff ff ff
> fabs(-4.3) = 4.3 = 9a 99 89 40
> ceilf(-4.3) = -4 = fc ff ff ff
> ceil(-4.3) = -4 = 50 8e 00 00
> exp(-4.3) = 0.0135686 = a7 4e 5e 3c
>
> -----------------
> fptest.c
> -----------------
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <math.h>
>
> void dumphex (void *adr, size_t sz)
> {
> char *ch = adr;
> printf (" =");
> do
> printf (" %02x", *ch++ & 0xff);
> while (--sz);
> puts ("");
> }
>
> int main (int argc, char **argv)
> {
> if (argc > 1) {
> double d = atof (argv[1]);
> float f, f2, f3;
> int i, i2, i3;
> printf ("atof(%s) = %g", argv[1], d);
> dumphex (&d, sizeof(d));
> sscanf (argv[1], "%f", &f);
> printf ("sscanf(%s, \"%%f\", &f) assigns f = %g", argv[1], f);
> dumphex (&f, sizeof(f));
> printf ("(int)%g = %d", f, i=(int)f);
> dumphex (&i, sizeof(i));
> printf ("fabs(%g) = %g", f, f2=fabs(f));
> dumphex (&f2, sizeof(f2));
> printf ("ceilf(%g) = %d", f, i2=ceilf(f));
> dumphex (&i2, sizeof(i2));
> printf ("ceil(%g) = %d", f, i2=ceil((double)f));
> dumphex (&i3, sizeof(i3));
> printf ("exp(%g) = %g", f, f3=exp((double)f));
> dumphex (&f3, sizeof(f3));
> return 0;
> }
> return 2;
> }
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
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