Diff for /wikisrc/ports/evbarm.mdwn between versions 1.88 and 1.89

version 1.88, 2020/09/15 07:21:58 version 1.89, 2020/09/15 07:33:25
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 about="""  about="""
 NetBSD/evbarm is the port of NetBSD to various evaluation and prototyping  NetBSD/evbarm is the port of NetBSD to various systems based on chips
 boards based on CPUs implementing the ARM architecture. NetBSD/evbarm also  implementing the ARM architecture. The "evb" component is a reference
 supports some specific embedded system products based on prototype board  to evaluation boards, the original target of the port, but this
 designs.  is no longer relevant - NetBSD/evbarm now runs on a range of
   hardware based on APCI or devicetrees, including a range of development
   boards, powerful servers, virtual machines, and even some laptops.
 ### CPU types  ### CPU types
 The evbarm port can be built with a variety of CPU options, corresponding to the  Various CPU variants are supported, e.g:
 [large array of ARM CPU architectures](https://en.wikipedia.org/wiki/ARM_architecture#Cores).  
 There are  - evbarm-earmv6hf - ARMv6 with EABI and hardware floating point, e.g.
 four main variables: the word size, the instruction set, the    the original Raspberry Pi.
 endianness, and whether there is hardware floating point.  By default  - evbarm-earmv7hf - ARMv7 with EABI and hardware floating point, e.g.
 the CPU type is "earm", and this implies aarch32 (32-bit), earmv5 cpu    most recent and common 32-bit ARM boards.
 architecture, little endian (el when explicitly stated), and soft  - evbarm-earmv7hfeb - Same as the above, but with the CPU running in
 (Emulated) floating point.  Another example, suitable for Raspberry PI    big endian mode.
 2, is earmv7hf, which is aarch32, the v7 instruction set, little  - evbarm-aarch64 - 64-bit ARMv8
 endian, and hardware floating point.  - evbarm-aarch64eb - Same as the above, but with the CPU running in
     big endian mode.
 Typically, various boards are best compiled with a CPU type that  
 matches the board's CPU and floating point support, but generally a  evbarm variants are little endian unless otherwise stated. NetBSD provides
 lower CPU instruction set version is workable on a newer board.  See  big endian images primarily for testing purposes and to ensure that the code
 build.sh and look for aliases for the evbarm port.  is endian-clean.
 Through NetBSD 8, the evbarm port has supported exclusively the  Since NetBSD 9.0, 64-bit ARM processors are supported (referred to here
 aarch32 (32-bit CPU) sub-family of the ARM architecture.  Some  as aarch64). These run with fully 64-bit kernels and userland. Running
 processors, such as many supporting the armv8 CPU architecture, also  32-bit ARM binaries is also supported with `compat32`.
 support a 64-bit instruction set, referred to as aarch64.  This is  
 sometimes referred to as a distinct port, [[NetBSD/aarch64|aarch64]],  
 with code in src/sys/arch/aarch64, but it is built as the evbarm port  
 with aarch64 cpu type, and available as the alias evbarm64.  
 Note that MACHINE_ARCH=aarch64 currently refers to the A64 instruction  
 set and the aarch64 architecture, built for the armv8 architecture.  
 (Note also that armv8 is the first architecture to support aarch64, so  
 this will not be an issue until at least armv9.)  
 ### armbsd.org builds  ### armbsd.org builds

Removed from v.1.88  
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  Added in v.1.89

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