Next up on creating armv7 MACHINE_ARCH: pre FCP stage

[Mark Millard]

On 2017-Jun-14, at 11:20 PM, Mark Millard <markmi at dsl-only.net> wrote:

> On 2017-Jun-14, at 10:22 PM, Warner Losh <imp at bsdimp.com> wrote:
> 
>> . . .
>> Comments?
> 
> I booted Ubuntu Mate on a BPI-M3 and tried:
> 
> $ uname -p
> armv7l
> 
> $ uname -ap
> Linux bpi-iot-ros-ai 3.4.39-BPI-M3-Kernel #1 SMP PREEMPT Tue May 3 13:47:01 UTC 2016 armv7l armv7l armv7l GNU/Linux
> 
> I was actually thinking that a "hf" might
> show up in how they name things if it was
> a hard float based build. But looking I
> see in /lib/ :
> 
> . . .
> drwxr-xr-x  3 root root  16384 Nov  4  2016 arm-linux-gnueabihf
> . . .
> lrwxrwxrwx  1 root root     30 Oct 14  2016 ld-linux-armhf.so.3 -> arm-linux-gnueabihf/ld-2.23.so
> lrwxrwxrwx  1 root root     24 Apr 21  2016 ld-linux.so.3 -> /lib/ld-linux-armhf.so.3
> . . .
> 
> and in /lib/arm-linux-gnueabihf/ :
> 
> lrwxrwxrwx 1 root root 10 Oct 14  2016 /lib/arm-linux-gnueabihf/ld-linux-armhf.so.3 -> ld-2.23.so
> 
> so it appears armv7l was used for naming a
> hard float build in uname -p.
> 
> Of course this does not check how uniform the
> various linux distributions are about such
> naming.
> 
> Still it may mean that for linux-matching "armv7"
> might not be the right name for uname -p output.

I tried another linux on the BPI-M3: gentoo .

# uname -p
ARMv7 Processor rev 5 (v7l)

(Wow. Not what I expected.)

# uname -pa
Linux bananapi 3.4.39-BPI-M3-Kernel #1 SMP PREEMPT Tue May 3 13:47:01 UTC 2016 armv7l ARMv7 Processor rev 5 (v7l) sun8i GNU/Linux

# uname -m
armv7l

# uname -i
sun8i

# ls -l /lib/ld-*
-rwxr-xr-x 1 root root 134192 Mar 26  2016 /lib/ld-2.21.so
lrwxrwxrwx 1 root root     10 Mar 26  2016 /lib/ld-linux-armhf.so.3 -> ld-2.21.so

So again armv7l seems to be the base name used for
a hardfloat little-endian context --although it
appears that "uname -m" gives text more likely to
be used in testing for how to configure to match
the live context. "uname -p" seems far less
standardized for its results. The same for
"uname -i".

===
Mark Millard
markmi at dsl-only.net