As Guo explained, upstream gcc does not support abi-v1 (only abi-v2), but
ck610 needs abi-v1 [0] [1]
To simplify things, we make the whole C-SKY architecture require gcc-9
or later, and add a single exception in gcc to force the ck610 to use
the C-SKY port.
Note that this does not change the default gcc version to be used for
C-SKY: the C-SKY port is still always the default one; the gcc-9 version
is only proposed as an alternative (except for ck610, of course).
[0] http://lists.busybox.net/pipermail/buildroot/2019-July/254386.html
[1] package/Makefile.in#73
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Guo Ren <guoren@kernel.org>
Cc: Arnout Vandecappelle <arnout@mind.be>
Cc: Romain Naour <romain.naour@gmail.com>
Acked-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
ck860 is newest CPU core of C-SKY with high performance & SMP
supported.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
The C-SKY architecture uses two different ABIs, depending on the core
being used:
- "abiv1" is a mcore based ISA with ELF_NUM:39 and does not support
FPU & VDSP. It is used only for the ck610 core.
- "abiv2" is C-SKY's own ISA with ELF_NUM:252 and supports FPU &
VDSP. It is used for the ck807, ck810, ck860 cores.
Since "abiv1" does not support FPU, BR2_GCC_TARGET_FLOAT_ABI will
always have the value "soft" for the ck610 core.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[Thomas: rework commit log]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
VDSP is C-SKY enhanced extension instruction set for SIMD, AI and DSP
operation. It is supported by abiv2, used by the ck807, ck810, ck860
cores.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[Thomas: update help text in Config.in.legacy about the BR2_CSKY_DSP
option.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
The DSP extention is in fact no longer used for C-SKY, nor supported
by C-SKY gcc, so we remove it.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[Thomas: split from the VDSP patch, add Config.in.legacy]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Calculating GCC_TARGET_CPU requires combining multiple flags, which
isn't very nicely expressed in Config.in, so let's move this into
arch.mk.csky, similarly to what is done in arch.mk.riscv.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[Thomas: rework commit log]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
It is too sad when an editor picks up the wrong syntax...
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This config option corresponds to the string returned by readelf for
the "Machine" field of the ELF header. It will be used to check if the
architecture of binaries built by Buildroot match the target
architecture.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit provides basic support for the C-SKY architecture.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
[Thomas: minor tweaks.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
