I've uploaded a possible patch to experimental, to avoid introducing
new build failures on other archs.
Diff below.
diff -Nru
acpica-unix-20200925/debian/patches/0001-Add-in-basic-infrastructure-for-big-endian-support.patch
acpica-unix-20200925/debian/patches/0001-Add-in-basic-infrastructure-for-big-endian-support.patch
---
acpica-unix-20200925/debian/patches/0001-Add-in-basic-infrastructure-for-big-endian-support.patch
2020-10-30 01:15:48.000000000 +0000
+++
acpica-unix-20200925/debian/patches/0001-Add-in-basic-infrastructure-for-big-endian-support.patch
2021-02-16 23:24:40.000000000 +0000
@@ -30,7 +30,7 @@
9 files changed, 242 insertions(+)
create mode 100644 source/components/utilities/utendian.c
-Index: acpica-unix2-20200925/generate/unix/acpibin/Makefile
+Index: acpica-unix-20200925/generate/unix/acpibin/Makefile
===================================================================
--- acpica-unix2-20200925.orig/generate/unix/acpibin/Makefile
+++ acpica-unix2-20200925/generate/unix/acpibin/Makefile
@@ -106,7 +106,7 @@
===================================================================
--- /dev/null
+++ acpica-unix2-20200925/source/components/utilities/utendian.c
-@@ -0,0 +1,205 @@
+@@ -0,0 +1,225 @@
+/******************************************************************************
+ *
+ * Module Name: utendian -- byte swapping support for other-endianness
@@ -263,7 +263,27 @@
+ return Result;
+}
+#else
-+UINT64 AcpiUtReadUint64 (void *SrcPtr) { return *(UINT64 *)SrcPtr; }
++UINT64 AcpiUtReadUint64 (void *SrcPtr) {
++#if defined(ACPI_MISALIGNMENT_NOT_SUPPORTED)
++ UINT64 Result = 0;
++ UINT8 *Dst = (UINT8 *)&Result;
++ UINT8 *Src = (UINT8 *)SrcPtr;
++
++ Dst[7] = Src[7];
++ Dst[6] = Src[6];
++ Dst[5] = Src[5];
++ Dst[4] = Src[4];
++ Dst[3] = Src[3];
++ Dst[2] = Src[2];
++ Dst[1] = Src[1];
++ Dst[0] = Src[0];
++
++ return Result;
++
++#else
++ return *(UINT64 *)SrcPtr;
++#endif
++}
+#endif
+
+/*******************************************************************************
diff -Nru acpica-unix-20200925/debian/patches/fix_ftbfs_mips64el.patch
acpica-unix-20200925/debian/patches/fix_ftbfs_mips64el.patch
--- acpica-unix-20200925/debian/patches/fix_ftbfs_mips64el.patch
1970-01-01 00:00:00.000000000 +0000
+++ acpica-unix-20200925/debian/patches/fix_ftbfs_mips64el.patch
2021-02-16 23:24:38.000000000 +0000
@@ -0,0 +1,13 @@
+Index: acpica-unix-20200925/source/include/platform/aclinux.h
+===================================================================
+--- acpica-unix-20200925.orig/source/include/platform/aclinux.h
++++ acpica-unix-20200925/source/include/platform/aclinux.h
+@@ -217,7 +217,7 @@
+
+ #if defined(__ia64__) || (defined(__x86_64__) && !defined(__ILP32__)) ||\
+ defined(__aarch64__) || defined(__PPC64__) ||\
+- defined(__s390x__) ||\
++ defined(__s390x__) || defined(__mips64) ||\
+ (defined(__riscv) && (defined(__LP64__) || defined(_LP64)))
+ #define ACPI_MACHINE_WIDTH 64
+ #define COMPILER_DEPENDENT_INT64 long
diff -Nru acpica-unix-20200925/debian/patches/series
acpica-unix-20200925/debian/patches/series
--- acpica-unix-20200925/debian/patches/series 2020-10-30 01:15:48.000000000
+0000
+++ acpica-unix-20200925/debian/patches/series 2021-02-16 23:24:29.000000000
+0000
@@ -61,3 +61,4 @@
armv7-str-fixes.patch
dbtest.patch
ull-32bit.patch
+fix_ftbfs_mips64el.patch
