The current CFLAGS (rv64imafdc) for the riscv64 targets do not contain
the full generic compute extension (g), as that also includes the
zicsr and zifencei extensions/instructions. Rename the default ISA to
'generic' to add distinction to the current binaries (although it's very
minimal), and use rv64gc for CFLAGS.
This is also a prep step for the upcoming gcv (vector-extension supporting)
targets like the Spacemit K1, and the thead-cores like the TH1520.
Compile-tested: all riscv64 targets
Runtime-tested:
- SiFive Unleashed (FU540)
- SiFive Unmatched (FU740)
- Nezha D1 (D1)
- VisionFive2 (JH7110)
Link: https://github.com/openwrt/openwrt/pull/18094
Tested-by: Chuanhong Guo <gch981213@gmail.com> # siflower target
Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>
143569c2ed
