buildroot/arch, branch 2018.02

arch: add Atom CPUs as Silvermont Architecture target

2018-01-01T12:05:16+00:00

The old Atom target is not really fitting for recent Atom CPUs based on Silvermont, Airmont or Goldmont. Those have more in common with older Desktop CPUs than old Atoms. Signed-off-by: Norbert Lange Signed-off-by: Thomas Petazzoni

arch/arm: default to Cortex-A53 for AArch64

2017-12-07T21:39:44+00:00

Since we re-organised the list of cores (in 52d500aa35) and introduced some new cores (in e9960da6ec, d632d9e5a9, 6317a199ec), the default for AArch64 was accidently changed from A53 to A35. So, restore the default to A53 for AArch64. Reported-by: daggs Signed-off-by: "Yann E. MORIN" Cc: daggs Cc: Thomas Petazzoni Signed-off-by: Peter Korsgaard

arch/arm: add armv8.1a cores

2017-11-24T22:30:43+00:00

The armv8.1a generation is a cumulative extension to armv8a. It adds new extensions, and makes some previously optional ones now mandatory. Since gcc correctly enables the appropriate extensions based on the core name, we don't really need to introduce a separate config for armv8.1a, and we can piggyback on armv8a. All those new cores are aarch64 only (gcc fails to build in arm mode). Signed-off-by: "Yann E. MORIN" Cc: Thomas Petazzoni Signed-off-by: Thomas Petazzoni

arch/arm: add some non-cortex armv8a cores

2017-11-24T22:30:36+00:00

Some need gcc-5, some gcc-6 and some gcc-7. The thunderx familly does not build in 32-bit mode (gcc complains that the CPU is unknown, and even gcc master only knows them as aarch64-only). Signed-off-by: "Yann E. MORIN" Cc: Thomas Petazzoni Signed-off-by: Thomas Petazzoni

arch/arm: add some armv8a cortex variants

2017-11-24T22:18:08+00:00

Signed-off-by: "Yann E. MORIN" Cc: Thomas Petazzoni Signed-off-by: Thomas Petazzoni

arch/arm: add cortex-A32

2017-11-24T22:11:52+00:00

The cortex-A32 is an armv8a core, but it lacks the optional AArch64 extensions, so can only work in 32-bit mode. Signed-off-by: "Yann E. MORIN" Cc: Thomas Petazzoni Signed-off-by: Thomas Petazzoni

arch/arm: armv8 is really armv8a

2017-11-24T22:01:41+00:00

For armv8, there are different profiles: A, M and R, like there is for armv7. So, rename our internal symbol to mirror what we do for armv7. Signed-off-by: "Yann E. MORIN" Cc: Thomas Petazzoni Signed-off-by: Thomas Petazzoni

arch/arm: simplify hiding non 64-bit cores

2017-11-24T22:01:03+00:00

Now that the cores are all oredered correctly, we can just enclose all the non 64-bit cores inside a big if-block, rather than have each of them have the dependency. Signed-off-by: "Yann E. MORIN" Cc: Thomas Petazzoni Signed-off-by: Thomas Petazzoni

arch/arm: re-order cores choice

2017-11-24T22:00:37+00:00

Currently, the logic for ordering the ARM cores in the choice is all but obvious. ;-) Reorder the choice by architecture generation, starting with armv4, ending with armv8. Add a comment before each generation, just for ease of use. Add a separate comment for armv7a and armv7m. Finally, order cores alphabetically inside the same generation (except for armv7m cores, listed after all armv7a cores). Signed-off-by: "Yann E. MORIN" Cc: Thomas Petazzoni Signed-off-by: Thomas Petazzoni

arch/mips: inverse the mfpxx logic

2017-11-24T21:45:48+00:00

Currently, the possibility to choose the floating point mode (32, xx or 64) is conditional on having a sufficiently recent gcc version. Which means that the architecture selection depends on the gcc version. But that's opposite to what we've always done in Buildroot: the software versions are conditional to the architecture options. There is nothing we can do about the hardware: it is there, we can't change it, while we can restrict ourselves to using software that is working on said hardware. Thus, we inverse the logic, to move the condition onto the software side: whenever mfpxx is selected, we restrict the toolchain selection to at least a gcc-5. And now, the blind BR2_TOOLCHAIN_HAS_MFPXX_OPTION symbol is no longer needed, so we get rid of it. Signed-off-by: "Yann E. MORIN" Cc: Thomas Petazzoni Cc: Vicente Olivert Riera Signed-off-by: Thomas Petazzoni