[dpdk-dev] [PATCH v1 2/2] mk: add sensible default target with defconfig
Hunt, David
david.hunt at intel.com
Thu May 25 15:04:27 CEST 2017
Hi Shreyansh,
Thanks for your comments. More thoughts below.
On 24/5/2017 7:10 AM, Shreyansh Jain wrote:
> Hello David,
>
> On Tuesday 23 May 2017 03:58 PM, David Hunt wrote:
>> Users can now use 'make defconfig' to generate a configuration using
>> the most appropriate defaults for the current machine.
>>
>> <arch-machine-execenv-toolchain>
>> arch taken from uname -m
>> machine defaults to native
>> execenv is taken from uname, Linux=linuxapp, otherwise bsdapp
>> toolchain is taken from $CC -v to see which compiler to use
>>
>> Signed-off-by: David Hunt <david.hunt at intel.com>
>> ---
>> mk/rte.sdkconfig.mk | 15 ++++++++++++---
>> mk/rte.sdkroot.mk | 4 ++--
>> 2 files changed, 14 insertions(+), 5 deletions(-)
>>
>> diff --git a/mk/rte.sdkconfig.mk b/mk/rte.sdkconfig.mk
>> index 1f2d6bd..4f30d56 100644
>> --- a/mk/rte.sdkconfig.mk
>> +++ b/mk/rte.sdkconfig.mk
>> @@ -60,16 +60,25 @@ showconfigs:
>>
>> .PHONY: notemplate
>> notemplate:
>> - @printf "No template specified. "
>> - @echo "Use T=template among the following list:"
>> + @printf "No template specified. Use 'make defconfig' or "
>> + @echo "use T=template from the following list:"
>> @$(MAKE) -rR showconfigs | sed 's,^, ,'
>>
>> +
>> +.PHONY: defconfig
>> +defconfig:
>> + @$(MAKE) config T=$(shell uname -m)-native-$(shell uname | \
>
> The idea to have 'make defconfig' do the works looks great to me.
> I am just worried about the above line - it wouldn't allow
> configurations like
> arm64-dpaa2-linuxapp-gcc or arm64-armv8a-linuxapp-gcc
> Basically, having the MACHINE default to 'native' would not be right
> in all cases.
>
> But, I don't have a better idea about how to detect this automatically.
> Or, we might use RTE_MACHINE someway.
>
Might I suggest that we default to armv8a for the defconfig in this
case? Would that be good enough? If you need something more specific,
then use the normal make config T=
Also, if you're using an unknown variant, you can always set your
RTE_TARGET, as per the other changes in the patch.
A possible proposal for a v2 patch could be:
uname -m Output Target
-------- ------------------
aarch64 arm64-armv8a-...
armv7l arm-armv7a-...
ppc64 ppc_64-power8-... (from wikipedia uname page, could ppc user
confirm this for me?)
x86_64 x86_64-native-...
i686 i686-native-...
Something along the lines of:
.PHONY: defconfig
defconfig:
@$(MAKE) config T=$(shell \
uname -m | awk '{ \
if ($$0 == "aarch64") { \
print "arm64-armv8a"} \
else if ($$0 == "armv7l") { \
print "arm-armv7a"} \
else if ($$0 == "ppc64") { \
print "ppc_64-power8"} \
else { \
printf "%s-native", $$0} }')-$(shell \
uname | awk '{ \
if ($$0 == "Linux") { \
print "linuxapp"} \
else { \
print "bsdapp"} }')-$(shell \
${CC} -v 2>&1 | \
grep " version " | cut -d ' ' -f 1)
That might make a reasonable start in the absence of a reliable method
of detecting Xgene/ThunderX/DPAA2 variants.
Regards,
Dave.
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