https://github.com/boostorg/boost/commit/791442bf1ed7a3b14893ed9e73ef2ab32b2a6026, and
https://github.com/boostorg/config/commit/1a55d1d9c6d1cf7739645080bdd92fe903b4211e without the file renaming.

--- a/boostcpp.jam
+++ b/boostcpp.jam
@@ -634,7 +634,7 @@ rule address-model ( )
     return <conditional>@boostcpp.deduce-address-model ;
 }
 
-local deducable-architectures = arm mips1 power riscv s390x sparc x86 combined ;
+local deducable-architectures = arm mips power riscv s390x sparc x86 combined ;
 feature.feature deduced-architecture : $(deducable-architectures) : propagated optional composite hidden ;
 for a in $(deducable-architectures)
 {
@@ -645,10 +645,10 @@ rule deduce-architecture ( properties * )
 {
     local result ;
     local filtered = [ toolset-properties $(properties) ] ;
-    local names = arm mips1 power riscv s390x sparc x86 combined ;
+    local names = arm mips power riscv s390x sparc x86 combined ;
     local idx = [ configure.find-builds "default architecture" : $(filtered)
         : /boost/architecture//arm
-        : /boost/architecture//mips1
+        : /boost/architecture//mips
         : /boost/architecture//power
         : /boost/architecture//riscv
         : /boost/architecture//s390x
--- a/libs/config/checks/architecture/Jamfile.jam
+++ b/libs/config/checks/architecture/Jamfile.jam
@@ -18,7 +18,8 @@ obj 64 : 64.cpp ;
 
 obj arm      : arm.cpp ;
 obj combined : combined.cpp ;
-obj mips1    : mips1.cpp ;
+obj mips     : mips1.cpp ;
+alias mips1  : mips ; # Backwards compatibility
 obj power    : power.cpp ;
 obj riscv    : riscv.cpp ;
 obj sparc    : sparc.cpp ;