diff --git a/compiler/rustc_target/src/spec/aarch64_be_unknown_netbsd.rs b/compiler/rustc_target/src/spec/aarch64_be_unknown_netbsd.rs
new file mode 100644
index 0000000000000..98ae05974aa84
--- /dev/null
+++ b/compiler/rustc_target/src/spec/aarch64_be_unknown_netbsd.rs
@@ -0,0 +1,17 @@
+use crate::abi::Endian;
+use crate::spec::{Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "aarch64_be-unknown-netbsd".into(),
+        pointer_width: 64,
+        data_layout: "E-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128".into(),
+        arch: "aarch64".into(),
+        options: TargetOptions {
+            mcount: "__mcount".into(),
+            max_atomic_width: Some(128),
+            endian: Endian::Big,
+            ..super::netbsd_base::opts()
+        },
+    }
+}
diff --git a/compiler/rustc_target/src/spec/mod.rs b/compiler/rustc_target/src/spec/mod.rs
index 10d38c34919c5..e09f8c9ea9170 100644
--- a/compiler/rustc_target/src/spec/mod.rs
+++ b/compiler/rustc_target/src/spec/mod.rs
@@ -1100,6 +1100,7 @@ supported_targets! {
     ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
 
     ("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
+    ("aarch64_be-unknown-netbsd", aarch64_be_unknown_netbsd),
     ("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
     ("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
     ("i686-unknown-netbsd", i686_unknown_netbsd),
diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index f22cdad7df411..c79fe04314668 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -327,6 +327,7 @@ def default_build_triple(verbose):
     cputype_mapper = {
         'BePC': 'i686',
         'aarch64': 'aarch64',
+        'aarch64eb': 'aarch64',
         'amd64': 'x86_64',
         'arm64': 'aarch64',
         'i386': 'i686',
diff --git a/src/doc/rustc/src/SUMMARY.md b/src/doc/rustc/src/SUMMARY.md
index 48efa67191ae9..35ae84e146dde 100644
--- a/src/doc/rustc/src/SUMMARY.md
+++ b/src/doc/rustc/src/SUMMARY.md
@@ -37,6 +37,7 @@
     - [riscv32imac-unknown-xous-elf](platform-support/riscv32imac-unknown-xous-elf.md)
     - [*-pc-windows-gnullvm](platform-support/pc-windows-gnullvm.md)
     - [\*-nto-qnx-\*](platform-support/nto-qnx.md)
+    - [\*-unknown-netbsd\*](platform-support/netbsd.md)
     - [*-unknown-openbsd](platform-support/openbsd.md)
     - [\*-unknown-uefi](platform-support/unknown-uefi.md)
     - [wasm64-unknown-unknown](platform-support/wasm64-unknown-unknown.md)
diff --git a/src/doc/rustc/src/platform-support.md b/src/doc/rustc/src/platform-support.md
index 75f97c1fc1ede..231ce673610e6 100644
--- a/src/doc/rustc/src/platform-support.md
+++ b/src/doc/rustc/src/platform-support.md
@@ -223,13 +223,14 @@ target | std | host | notes
 `aarch64-unknown-freebsd` | ✓ | ✓ | ARM64 FreeBSD
 `aarch64-unknown-hermit` | ✓ |  | ARM64 HermitCore
 `aarch64-unknown-linux-gnu_ilp32` | ✓ | ✓ | ARM64 Linux (ILP32 ABI)
-`aarch64-unknown-netbsd` | ✓ | ✓ |
+[`aarch64-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | ARM64 NetBSD
 [`aarch64-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | ARM64 OpenBSD
 `aarch64-unknown-redox` | ? |  | ARM64 Redox OS
 `aarch64-uwp-windows-msvc` | ? |  |
 `aarch64-wrs-vxworks` | ? |  |
 `aarch64_be-unknown-linux-gnu_ilp32` | ✓ | ✓ | ARM64 Linux (big-endian, ILP32 ABI)
 `aarch64_be-unknown-linux-gnu` | ✓ | ✓ | ARM64 Linux (big-endian)
+[`aarch64_be-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | ARM64 NetBSD (big-endian)
 [`arm64_32-apple-watchos`](platform-support/apple-watchos.md) | ✓ | | ARM Apple WatchOS 64-bit with 32-bit pointers
 [`armeb-unknown-linux-gnueabi`](platform-support/armeb-unknown-linux-gnueabi.md) | ✓ | ? | ARM BE8 the default ARM big-endian architecture since [ARMv6](https://developer.arm.com/documentation/101754/0616/armlink-Reference/armlink-Command-line-Options/--be8?lang=en).
 `armv4t-none-eabi` | * |  | ARMv4T A32
@@ -237,7 +238,7 @@ target | std | host | notes
 [`armv5te-none-eabi`](platform-support/armv5te-none-eabi.md) | * | | ARMv5TE A32
 `armv5te-unknown-linux-uclibceabi` | ? |  | ARMv5TE Linux with uClibc
 `armv6-unknown-freebsd` | ✓ | ✓ | ARMv6 FreeBSD
-`armv6-unknown-netbsd-eabihf` | ? |  |
+[`armv6-unknown-netbsd-eabihf`](platform-support/netbsd.md) | ✓ | ✓ | ARMv6 NetBSD w/hard-float
 [`armv6k-nintendo-3ds`](platform-support/armv6k-nintendo-3ds.md) | ? |  | ARMv6K Nintendo 3DS, Horizon (Requires devkitARM toolchain)
 `armv7-apple-ios` | ✓ |  | ARMv7 iOS, Cortex-a8
 [`armv7-sony-vita-newlibeabihf`](platform-support/armv7-sony-vita-newlibeabihf.md) | ? |  | ARM Cortex-A9 Sony PlayStation Vita (requires VITASDK toolchain)
@@ -245,7 +246,7 @@ target | std | host | notes
 [`armv7-unknown-linux-uclibceabi`](platform-support/armv7-unknown-linux-uclibceabi.md) | ✓ | ✓ | ARMv7 Linux with uClibc, softfloat
 [`armv7-unknown-linux-uclibceabihf`](platform-support/armv7-unknown-linux-uclibceabihf.md) | ✓ | ? | ARMv7 Linux with uClibc, hardfloat
 `armv7-unknown-freebsd` | ✓ | ✓ | ARMv7 FreeBSD
-`armv7-unknown-netbsd-eabihf` | ✓ | ✓ |
+[`armv7-unknown-netbsd-eabihf`](platform-support/netbsd.md) | ✓ | ✓ | ARMv7 NetBSD w/hard-float
 `armv7-wrs-vxworks-eabihf` | ? |  |
 [`armv7a-kmc-solid_asp3-eabi`](platform-support/kmc-solid.md) | ✓ |  | ARM SOLID with TOPPERS/ASP3
 [`armv7a-kmc-solid_asp3-eabihf`](platform-support/kmc-solid.md) | ✓ |  | ARM SOLID with TOPPERS/ASP3, hardfloat
@@ -261,7 +262,7 @@ target | std | host | notes
 `i686-apple-darwin` | ✓ | ✓ | 32-bit macOS (10.7+, Lion+)
 `i686-pc-windows-msvc` | * |  | 32-bit Windows XP support
 `i686-unknown-haiku` | ✓ | ✓ | 32-bit Haiku
-`i686-unknown-netbsd` | ✓ | ✓ | NetBSD/i386 with SSE2
+[`i686-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | NetBSD/i386 with SSE2
 [`i686-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | 32-bit OpenBSD
 `i686-uwp-windows-gnu` | ? |  |
 `i686-uwp-windows-msvc` | ? |  |
@@ -281,7 +282,7 @@ target | std | host | notes
 `msp430-none-elf` | * |  | 16-bit MSP430 microcontrollers
 `powerpc-unknown-linux-gnuspe` | ✓ |  | PowerPC SPE Linux
 `powerpc-unknown-linux-musl` | ? |  |
-`powerpc-unknown-netbsd` | ✓ | ✓ |
+[`powerpc-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | NetBSD 32-bit powerpc systems
 `powerpc-unknown-openbsd` | ? |  |
 `powerpc-wrs-vxworks-spe` | ? |  |
 `powerpc-wrs-vxworks` | ? |  |
@@ -304,7 +305,7 @@ target | std | host | notes
 [`riscv64gc-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | OpenBSD/riscv64
 `s390x-unknown-linux-musl` |  |  | S390x Linux (kernel 3.2, MUSL)
 `sparc-unknown-linux-gnu` | ✓ |  | 32-bit SPARC Linux
-`sparc64-unknown-netbsd` | ✓ | ✓ | NetBSD/sparc64
+[`sparc64-unknown-netbsd`](platform-support/netbsd.md) | ✓ | ✓ | NetBSD/sparc64
 [`sparc64-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | OpenBSD/sparc64
 `thumbv4t-none-eabi` | * |  | ARMv4T T32
 [`thumbv5te-none-eabi`](platform-support/armv5te-none-eabi.md) | * | | ARMv5TE T32
diff --git a/src/doc/rustc/src/platform-support/netbsd.md b/src/doc/rustc/src/platform-support/netbsd.md
new file mode 100644
index 0000000000000..a1969524a20e4
--- /dev/null
+++ b/src/doc/rustc/src/platform-support/netbsd.md
@@ -0,0 +1,107 @@
+# \*-unknown-netbsd
+
+**Tier: 3**
+
+[NetBSD] multi-platform 4.4BSD-based UNIX-like operating system.
+
+[NetBSD]: https://www.NetBSD.org/
+
+The target names follow this format: `$ARCH-unknown-netbsd{-$SUFFIX}`,
+where `$ARCH` specifies the target processor architecture and
+`-$SUFFIX` (optional) might indicate the ABI. The following targets
+are currently defined running NetBSD:
+
+|          Target name           | NetBSD Platform |
+|--------------------------------|-----------------|
+| `amd64-unknown-netbsd`         | [amd64 / x86_64 systems](https://wiki.netbsd.org/ports/amd64/) |
+| `armv7-unknown-netbsd-eabihf`  | [32-bit ARMv7 systems with hard-float](https://wiki.netbsd.org/ports/evbarm/) |
+| `armv6-unknown-netbsd-eabihf`  | [32-bit ARMv6 systems with hard-float](https://wiki.netbsd.org/ports/evbarm/) |
+| `aarch64-unknown-netbsd`       | [64-bit ARM systems, little-endian](https://wiki.netbsd.org/ports/evbarm/) |
+| `aarch64_be-unknown-netbsd`    | [64-bit ARM systems, big-endian](https://wiki.netbsd.org/ports/evbarm/) |
+| `i586-unknown-netbsd`          | [32-bit i386, restricted to Pentium](https://wiki.netbsd.org/ports/i386/) |
+| `i686-unknown-netbsd`          | [32-bit i386 with SSE](https://wiki.netbsd.org/ports/i386/) |
+| `mipsel-unknown-netbsd`        | [32-bit mips, requires mips32 cpu support](https://wiki.netbsd.org/ports/evbmips/) |
+| `powerpc-unknown-netbsd`       | [Various 32-bit PowerPC systems, e.g. MacPPC](https://wiki.netbsd.org/ports/macppc/) |
+| `sparc64-unknown-netbsd`       | [Sun UltraSPARC systems](https://wiki.netbsd.org/ports/sparc64/) |
+
+All use the "native" `stdc++` library which goes along with the natively
+supplied GNU C++ compiler for the given OS version.  Many of the bootstraps
+are built for NetBSD 9.x, although some exceptions exist (some
+are built for NetBSD 8.x but also work on newer OS versions).
+
+
+## Designated Developers
+
+- [@he32](https://github.com/he32), `he@NetBSD.org`
+- [NetBSD/pkgsrc-wip's rust](https://github.com/NetBSD/pkgsrc-wip/blob/master/rust/Makefile) maintainer (see MAINTAINER variable). This package is part of "pkgsrc work-in-progress" and is used for deployment and testing of new versions of rust
+- [NetBSD's pkgsrc lang/rust](https://github.com/NetBSD/pkgsrc/tree/trunk/lang/rust) for the "proper" package in pkgsrc.
+- [NetBSD's pkgsrc lang/rust-bin](https://github.com/NetBSD/pkgsrc/tree/trunk/lang/rust-bin) which re-uses the bootstrap kit as a binary distribution and therefore avoids the rather protracted native build time of rust itself
+
+Fallback to pkgsrc-users@NetBSD.org, or fault reporting via NetBSD's
+bug reporting system.
+
+## Requirements
+
+The `amd64-unknown-netbsd` artifacts is being distributed by the
+rust project.
+
+The other targets are built by the designated developers (see above),
+and the targets are initially cross-compiled, but many if not most
+of them are also built natively as part of testing.
+
+
+## Building
+
+The default build mode for the packages is a native build.
+
+
+## Cross-compilation
+
+These targets can be cross-compiled, and we do that via the pkgsrc
+package(s).
+
+Cross-compilation typically requires the "tools" and "dest" trees
+resulting from a normal cross-build of NetBSD itself, ref. our main
+build script, `build.sh`.
+
+See e.g. [do-cross.mk
+Makefile](https://github.com/NetBSD/pkgsrc/tree/trunk/lang/rust/do-cross.mk)
+for the Makefile used to cross-build all the above NetBSD targets
+(except for the `amd64` target).
+
+The major option for the rust build is whether to build rust with
+the LLVM rust carries in its distribution, or use the LLVM package
+installed from pkgsrc.  The `PKG_OPTIONS.rust` option is
+`rust-internal-llvm`, ref.  [the rust package's options.mk make
+fragment](https://github.com/NetBSD/pkgsrc/blob/trunk/lang/rust/options.mk).
+It defaults to being set for a few of the above platforms, for
+various reasons (see comments), but is otherwise unset and therefore
+indicates use of the pkgsrc LLVM.
+
+
+## Testing
+
+The Rust testsuite could presumably be run natively.
+
+For the systems where the maintainer can build natively, the rust
+compiler itself is re-built natively.  This involves the rust compiler
+being re-built with the newly self-built rust compiler, so excercises
+the result quite extensively.
+
+Additionally, for some systems we build `librsvg`, and for the more
+capable systems we build and test `firefox` (amd64, i386, aarch64).
+
+
+## Building Rust programs
+
+Rust ships pre-compiled artifacts for the `amd64-unknown-netbsd`
+target.
+
+For the other systems mentioned above, using the `pkgsrc` route is
+probably the easiest, possibly via the `rust-bin` package to save
+time, see the `RUST_TYPE` variable from the `rust.mk` Makefile
+fragment.
+
+The pkgsrc rust package has a few files to assist with building
+pkgsrc packages written in rust, ref. the `rust.mk` and `cargo.mk`
+Makefile fragments in the `lang/rust` package.