buildroot/arch, branch 2017.08

arch/arm: add big.LITTLE cpu variants

2017-07-22T21:29:24+00:00

The big.LITTLE configurations can be optimised for by gcc, and a few users wonder what they should choose when they have such CPUs. Add new entries for those big.LITTLE configurations. Note: the various combos were added in various gcc versions, but only really worked in later versions: Variant | Introduced in | First built in ----------+---------------+---------------- a15-a7 | 4.9 | 4.9 a17-a7 | 5 | 5 a57-a53 | 4.9 | 6 a72-a53 | 5 | 6 Signed-off-by: "Yann E. MORIN" Cc: Thomas Petazzoni Cc: Thomas De Schampheleire Cc: Baruch Siach Signed-off-by: Thomas Petazzoni

arch/mips: add option for toolchains supporting -mfpxx

2017-07-21T20:49:18+00:00

-mfpxx option was added in gcc-5.1.0 so make sure that users cannot select the "xx" fp32 mode when using toolchains that have a gcc older than 5.1.0. -mfp32 and -mfp64 were added in gcc-4.1.0, so given the older gcc version we support in Buildroot (in the GCC_AT_LEAST options) is 4.3 we don't need to do anything else for them. Signed-off-by: Vicente Olivert Riera Signed-off-by: Thomas Petazzoni

arch/mips: add option for toolchains supporting -mnan

2017-07-21T20:48:51+00:00

-mnan option was added in gcc-4.9.0 so make sure that users cannot select the NaN mode when using toolchains that have a gcc older than 4.9.0, and also make sure that the -mnan option is not passed at all to the toolchain-wrapper and target cflags. Signed-off-by: Vicente Olivert Riera Signed-off-by: Thomas Petazzoni

arch/mips: improve help text of FP32 mode option

2017-07-19T19:47:11+00:00

Signed-off-by: Vicente Olivert Riera Signed-off-by: Thomas Petazzoni

arch/mips: improve help text of NaN option

2017-07-19T19:47:04+00:00

Signed-off-by: Vicente Olivert Riera Signed-off-by: Thomas Petazzoni

arch/mips: add support for MIPS32 FP mode

2017-07-16T14:45:22+00:00

MIPS32 support different FP modes (32,xx,64), so give the user the opportunity to choose between them. That will cause host-gcc to be built using the --with-fp-32=[32|xx|64] configure option. Also the -mfp[32|xx|64] gcc option will be added to TARGET_CFLAGS and to the toolchain wrapper. FP mode option shouldn't be used for soft-float, so we add logic in the toolchain wrapper if -msoft-float is among the arguments in order to not append the -fp[[32|xx|64] option, otherwise the compilation may fail. Information about FP modes here: - https://sourceware.org/binutils/docs/as/MIPS-Options.html - https://dmz-portal.imgtec.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_Interlinking#5._Generating_modeless_code Signed-off-by: Vicente Olivert Riera Signed-off-by: Thomas Petazzoni

arch/mips: add support for MIPS NaN

2017-07-16T14:35:39+00:00

MIPS supports two different NaN encodings, legacy and 2008. Information about MIPS NaN encodings can be found here: https://sourceware.org/binutils/docs/as/MIPS-NaN-Encodings.html NaN legacy is the only option available for R2 cores and older. NaN 2008 is the only option available for R6 cores. R5 cores can have either NaN legacy or NaN 2008, depending on the implementation. So, if the user selects a generic R5 target architecture variant, we show a choice menu with both options available. For well known R5 cores we directly select the NaN enconding they use. Signed-off-by: Vicente Olivert Riera Signed-off-by: Thomas Petazzoni

arch/arm: fix -mcpu default values for AArch64

2017-07-10T16:04:16+00:00

We have to specify the -mcpu value, even in 64-bit mode. For AArch64, +fp and +simd are the default, so they are totally useless. Signed-off-by: "Yann E. MORIN" Cc: Thomas Petazzoni Cc: Baruch Siach Signed-off-by: Thomas Petazzoni

uboot: apply xtensa overlay

2017-07-09T15:03:45+00:00

Xtensa core configuration must be added to U-Boot before it can be built for that xtensa CPU variant. Extract configuration files from the xtensa overlay as is done for other packages that need to be configured for a specific xtensa core. Signed-off-by: Max Filippov Signed-off-by: Thomas Petazzoni

linux: apply xtensa overlay

2017-07-09T15:03:37+00:00

Xtensa core configuration must be added to linux before it can be built for that xtensa CPU variant. Extract configuration files from the xtensa overlay as is done for other packages that need to be configured for a specific xtensa core. Signed-off-by: Max Filippov Signed-off-by: Thomas Petazzoni