[Udpcast] UDP Cast ready-made boot images and i686 issues

Henrique Rodrigues henrique.rodrigues at ist.utl.pt
Wed Sep 16 14:00:21 CEST 2009

On Mon, January 19, 2009 17:39, Alain Knaff wrote:
> Henrique Rodrigues wrote:
>> Hello,
>> I've been using UDP Cast extensively for a while now and I love it, but
>> I
>> had an issue last week and I want to share it witou you.
>> The UDP Cast website provides handy ready-made boot images. Apparently,
>> those images are compiled for i686 and I couldn't make them work on an
>> older machine because the processor doesn't implement the CMOV
>> operation.
>> The problem seem to belong to GCC, because it thinks that every i686
>> processor implements the optional CMOV operation, which is not true.
>> I solved the problem by compiling my own UDP Cast kernel, but I suggest
>> that the next UDP Cast ready-made boot images drop the i686 requirement
>> and stick to i386, for compatibility reasons.
>> Is this a reasonable request?
>> Thank you and best regards,
>> Henrique Rodrigues
> I'll take note of this for the next release
> Alain


I just want to remind that this is still a problem. The issue can be
reproduced with QEMU. Example:

$ qemu -cpu 486 -boot d -cdrom /home/hmr/udpcd.iso

With my custom kernel, compiled for i386, it works fine.

Best regards,
Henrique Rodrigues

Henrique Rodrigues
Engenharia Informatica e de Computadores - Instituto Superior Tecnico

More information about the Udpcast mailing list