arm or armeb?

Hi,

I plan to cross-compile for an arm chip but how to know if I should choose
arm or armeb machine?

Thanks

Re: arm or armeb?

Jean-Marc Beaune wrote:
> Hi,
>  
> I plan to cross-compile for an arm chip but how to know if I should
> choose arm or armeb machine?
>  
> Thanks
> -- 
> Jean-Marc
Depends.. Maybe give details of your bootloader, board, peripherals,
CPU, etc..

--
Karl

Re: arm or armeb?

Re: arm or armeb?

Jean-Marc Beaune wrote:
> Hi,
>  
> The details:
>  
> - Processor: 16/32 bit *AT91SAM7X256* (ARM7TDMI-S™)
> - 256 K Flash
> - 64 K RAM
> - USB 2.0
> - Ethernet 10/100 Mbits
> - 2 x RS-232
> - ADC (10 bits), CAN, 2 x UARTs, TWI(I2C), 2 x SPI, 3 x timers
> 32bit, SSC, 4 x PWM, WDT, PDC (DMA)
> - Frequency up to  55 MHz
> - JTAG connector (ARM's 2 x 10 pins - ARM-JTAG compatible)
> - Color TFT 128 x 128 pixels
> - SD™/MMC™
> - Mini-joystick
> - Loudspeaker
> - Audio input/output
> - Crystal 18,432 MHz sur support
> - RESET buton
> - Dimension: 128 x 98 mm
>  
> The question is not specifically for this hardware but more "when to
> choose arm and when to choose armeb" ?
>  
> Thank you
>
AFIK,  you can't run linux on  an ARM TDMI with 64K of RAM  

Using the same endianess as your bootloader will save you from byte
swapping.     If you can use the same endianness as the rest of your HW,
it will save the byte sapping operations and may make your system faster.

Some people prefer little endian, because other SW/ drivers has bugs on
little endian machines.

More about endianness you can probably get from googl'ing.

--
Karl

Re: arm or armeb?

Re: arm or armeb?

Jean-Marc Beaune wrote:
> The question is not specifically for this hardware but more "when to choose
> arm and when to choose armeb" ?

If your end application is network heavy, I would choose big endian
(which is Network Byte Order).  Outside of that, little endian is
preferred by a lot of folks simply because it gets more testing.  Most
drivers and apps are written on and for little endian architectures.

hth,

Jason.

Re: arm or armeb?

On Fri, 2008-10-03 at 13:34 +0200, Jean-Marc Beaune wrote:
> Hi,
>  
> The details:
>  
> - Processor: 16/32 bit AT91SAM7X256 (ARM7TDMI-S™)
> - 256 K Flash
> - 64 K RAM
> - USB 2.0
> - Ethernet 10/100 Mbits
> - 2 x RS-232
> - ADC (10 bits), CAN, 2 x UARTs, TWI(I2C), 2 x SPI, 3 x timers
> 32bit, SSC, 4 x PWM, WDT, PDC (DMA)
> - Frequency up to  55 MHz 
> - JTAG connector (ARM's 2 x 10 pins - ARM-JTAG compatible)
> - Color TFT 128 x 128 pixels
> - SD™/MMC™
> - Mini-joystick
> - Loudspeaker
> - Audio input/output
> - Crystal 18,432 MHz sur support
> - RESET buton
> - Dimension: 128 x 98 mm
>  
> The question is not specifically for this hardware but more "when to
> choose arm and when to choose armeb" ?

Just talked to a friend over at atmel. He confirms that you probably
want a arm-softfloat-linux-uclibc toolchain.

Generally the intel xscale chips tend to be the BE ones that we see on
arm. Otherwise most everything else is LE.

> Thank you
> 
> 
> 
> On Fri, Oct 3, 2008 at 1:05 PM, Karl Hiramoto <karl@...>
> wrote:
>         
>         Jean-Marc Beaune wrote:
>         > Hi,
>         >
>         > I plan to cross-compile for an arm chip but how to know if I
>         should
>         > choose arm or armeb machine?
>         >
>         > Thanks
>         > --
>         > Jean-Marc
>         
>         Depends.. Maybe give details of your bootloader, board,
>         peripherals,
>         CPU, etc..
>         
>         
>         --
>         Karl
>         
>         
> 
> 
> 
> -- 
> Jean-Marc
> 

Trying to get toolchain

Hi,

I'm trying to install the toolchain and regardless of the tuple I use
crossdev fails to compile gcc.

Any idea?
Please tell me if you need more info.

Thank you,

Re: Trying to get toolchain

Jean-Marc Beaune wrote:
> I'm trying to install the toolchain and regardless of the tuple I
> use crossdev fails to compile gcc.
> 
> Any idea?
> Please tell me if you need more info.

Versions of all packages involved and the build log would be helpful.

//Peter

Re: Trying to get toolchain

On Fri, 2008-10-10 at 15:07 +0200, Jean-Marc Beaune wrote:
> Hi,
>  
> I'm trying to install the toolchain and regardless of the tuple I use
> crossdev fails to compile gcc.
>  
> Any idea?
> 

Chances are you are hitting the bug with crossdev and headers.

If so.

crossdev $CTARGET
#wait for failure.
USE="-*" emerge -O cross-$CTARGET/gcc
crossdev $CTARGET

Good luck.