ARM EABI buildroot

[Daniel Smolik]

Tzungder Lin napsal(a):
> If you use buildroot to create your toolchain
> It seems config gcc default to ARMv5T architecture
> Maybe that's why you got illegal instruction exceptions...
> I think you could try to config gcc default to ARMv4T by hand.
> (gcc/config/arm/linux-eabi.h)
> I did this to make my ARMv4 CPU support the EABI interface
> (though without thumb and normal mode interworking)
> FYR
> 

I test #define SUBTARGET_CPU_DEFAULT TARGET_CPU_arm7tdmi

but still the same. I found another root filesystem from Debian EABI and 
situation is the same. May be problem is in kernel or my CPU doesn't 
support this.

			Dan






> On 5/30/07, Tzungder Lin <tzungder at gmail.com> wrote:
>> Hi,
>>
>> FYR
>> "The EABI includes thumb interworking, which means that 16-bit Thumb
>> and normal 32-bit ARM instructions can be mixed at function-level
>> granularity. With current gcc this requires at least an armv4t core,
>> because it uses the BX instruction which does not exist in armv4 or
>> earlier." --- from debian-eabi-arm
>>
>> I think it's ok.
>>
>>
>> On 5/30/07, Daniel Smolik <marvin at mydatex.cz> wrote:
>> > Tzungder Lin napsal(a):
>> > > Hi, what's your ARM version?
>> > > EABI will use BX, BLX instructions which only be supported in ARMv4t
>> > > and the later versions.
>> > > FYR
>> > Hi,
>> > this is my /proc/cpuinfo
>> >
>> > Processor       : ARM920T rev 0 (v4l)
>> >
>> > BogoMIPS        : 49.86
>> >
>> > Features        : swp half thumb
>> >
>> > CPU implementer : 0x41
>> >
>> > CPU architecture: 4T
>> >
>> > CPU variant     : 0x1
>> >
>> > CPU part        : 0x920
>> >
>> > CPU revision    : 0
>> >
>> > Cache type      : write-back
>> >
>> > Cache clean     : cp15 c7 ops
>> >
>> > Cache lockdown  : format A
>> >
>> > Cache format    : Harvard
>> >
>> > I size          : 16384
>> >
>> > I assoc         : 64
>> >
>> > I line length   : 32
>> >
>> > I sets          : 8
>> >
>> > D size          : 16384
>> >
>> > D assoc         : 64
>> >
>> > D line length   : 32
>> >
>> > D sets          : 8
>> >
>> > Is it OK for EABI ?
>> >
>> >                         Dan
>> >
>> >
>> >
>> >
>> >
>> > >
>> > > On 5/29/07, Daniel Smolik <marvin at mydatex.cz> wrote:
>> > >> Fernando Rodriguez napsal(a):
>> > >> > Have you got EABI support built in the kernel?
>> > >> >
>> > >> > Fernando
>> > >> >
>> > >> > Daniel Smolik wrote:
>> > >> >> Hi,
>> > >> >> have anybody working uClibc with 2.6 kernel on ARM with EABI?
>> > >> >> I compile buildroot with EABI support but when kenel boots I 
>> only see
>> > >> >> Freeing unused kernel memory and it's all. When I compile 
>> buildroot
>> > >> and
>> > >> >> uClibc with OABI (and apply my ugly hack to _NR_syscall) all 
>> works.
>> > >> >> I compile static version of busybox and boot to EABI root all 
>> command
>> > >> >> crash with Illegal instruction.
>> > >> >>
>> > >> >>
>> > >> >>                      Dan
>> > >> >>
>> > >>
>> > >> Yes I have, I try disable/enable Maverick Crunch support and 
>> still the
>> > >> same.
>> > >>
>> > >>                                 Dan
>> > >> _______________________________________________
>> > >> uClibc mailing list
>> > >> uClibc at uclibc.org
>> > >> http://busybox.net/cgi-bin/mailman/listinfo/uclibc
>> > >>
>> >
>> >
>> > --
>> > Mydatex s r.o.
>> > http://www.mydatex.cz
>> > email: smolik at mydatex.cz
>> > mob: 604200362
>> > tel: 226210085
>> >
>>


-- 
Mydatex s r.o.
http://www.mydatex.cz
email: smolik at mydatex.cz
mob: 604200362
tel: 226210085