Re: [OpenWrt-Devel] Hard float ABI for BCM2708/BCM2709
On 07/11/2015 07:21 PM, Florian Fainelli wrote: > Le 11 juil. 2015 09:52, "Matthias Schiffer" > a écrit : >> >> Hi, >> I've noticed that OpenWrt currently uses the soft-float ABI in the >> Raspberry Pi images. Is there a specific reason hard float is not used, >> even though most other distributions like Raspbian have switched to it? > > I do not think there was any particular reason. This was one of the few > ARM-based targets that are not armv5, however armv5 may have been used as a > template to kick the initial port. > >> >> I tried adding "fpu" to FEATURES to enable hard-float, and the generated >> images seem to work fine. > > If you want to submit a patch doing this, I will gladly apply it, we may > have to set a different FPU ABI between brcm2708 and 09 though. > -- > Florian > Okay, I'll do some more tests on both brcm2708 and 09 and prepare a patch. I've noticed that currently the toolchain directory naming is somewhat broken in regard to FP ABIs: the 'fpu' FEATURES flag affects the flags the toolchain is built with (--with-float=soft), but this difference isn't reflected in the directory name. I currently see two ways to fix this: 1. Add a 'fpu' or 'softfp' suffix to the directory name (as it is done with 'spe') 2. Don't configure fpu in FEATURES, but make the value of CONFIG_HAS_FPU depend on CPU_TYPE/CPU_SUBTYPE. Can it ever happen that we need the same CPU_TYPE/CPU_SUBTYPE combination both with and without HAS_FPU? I see the flag has been introduced in r11337 by kaloz. Or even both, so the directory suffix will be adjusted accordingly when CONFIG_SOFT_FLOAT is changed manually. Matthias signature.asc Description: OpenPGP digital signature ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
Re: [OpenWrt-Devel] Hard float ABI for BCM2708/BCM2709
Le 11 juil. 2015 09:52, "Matthias Schiffer" a écrit : > > Hi, > I've noticed that OpenWrt currently uses the soft-float ABI in the > Raspberry Pi images. Is there a specific reason hard float is not used, > even though most other distributions like Raspbian have switched to it? I do not think there was any particular reason. This was one of the few ARM-based targets that are not armv5, however armv5 may have been used as a template to kick the initial port. > > I tried adding "fpu" to FEATURES to enable hard-float, and the generated > images seem to work fine. If you want to submit a patch doing this, I will gladly apply it, we may have to set a different FPU ABI between brcm2708 and 09 though. -- Florian ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
Re: [OpenWrt-Devel] Hard float ABI for BCM2708/BCM2709
Probably no body checked until now if it works and devs went with safe choice. Just my 2c. On 11 July 2015 at 18:51, Matthias Schiffer wrote: > Hi, > I've noticed that OpenWrt currently uses the soft-float ABI in the > Raspberry Pi images. Is there a specific reason hard float is not used, > even though most other distributions like Raspbian have switched to it? > > I tried adding "fpu" to FEATURES to enable hard-float, and the generated > images seem to work fine. > > Matthias > > > ___ > openwrt-devel mailing list > openwrt-devel@lists.openwrt.org > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel > ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
[OpenWrt-Devel] Hard float ABI for BCM2708/BCM2709
Hi, I've noticed that OpenWrt currently uses the soft-float ABI in the Raspberry Pi images. Is there a specific reason hard float is not used, even though most other distributions like Raspbian have switched to it? I tried adding "fpu" to FEATURES to enable hard-float, and the generated images seem to work fine. Matthias signature.asc Description: OpenPGP digital signature ___ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
