[AArch64] libgloss nosys.specs

[Alexander Fedotov]

Hello

Could anyone describe main idea how to use newlib for AArch64
baremetal with nosys.specs ?

I'm observing following problems:
1. crt0.s always build with ARM_RDI_MONITOR, while ARM port has
different way with rdimon-crt0.s. ARM rdimon.specs utilize
rdimon-crt0.s, while AArch64 is not.
2. how to run it with disabled semihosting and nosys.specs ? Core just
stuck on HLT instruction on third line of _start ( AngelSVCAsm
AngelSVC) and that's all.

Best regards,
Alex