[Openmcl-devel] resolved problem with ccl on Linux ARM

moore at bricoworks.com moore at bricoworks.com
Wed Feb 24 09:16:31 PST 2016

> Thanks.
> I don't think that CCL cares where the text segment starts on ARM Linux
> any more, though it once did
> (for fairly bloodcurdling reasons.)
> If you get a chance, could you try:
> 1 running ccl on your tegra, noting the pid of the resulting process
> (PID below)
> 2 in another shell, doing
> $ cat /proc/PID/maps/
> /and letting me see the output ?
> whatever may be there, there is no reason for the linker script to
> clobber it, but I'm
> curious.
Here you go. I don't think anything is there; it is just unmapped.

> As far as I know, we should change or remove the custom linker script.
> On 02/24/2016 01:58 AM, Timothy Moore wrote:
>> Hi,
>> I was unable to run ccl on an NVidia Tegra running Arch Linux. The
>> program would be killed immediately on startup; I couldn't even start it
>> using gdb. The problem turned out to be that the start of the
>> executable's text segment was mapped to address 0x0  (or at least to a
>> low address), which is reserved in this configuration. I changed the
>> linker script to initialize the beginning of the text segment in the
>> same way that the default script does; I'm happy to report that ccl
>> works very well on this Acer Chromebook now.
>> I have no idea if the memory map is particular to Arch Linux, or this
>> version of the kernel (3.10.18 arm7l), the ARM version, or what. Here is
>> the /proc/cpuinfo for one (out of four) processor:
>> processor	: 0
>> model name	: ARMv7 Processor rev 3 (v7l)
>> BogoMIPS	: 22.84
>> Features	: swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls vfpv4
>> idiva idivt vfpd32 lpae
>> CPU implementer	: 0x41
>> CPU architecture: 7
>> CPU variant	: 0x3
>> CPU part	: 0xc0f
>> CPU revision	: 3
>> Attached is my fix to the linker script. I don't know if this is
>> sufficiently generic to work for Linux on ARM in general.
>> Thanks,
>> Tim
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