1.  Obtain mpc8xx-2.2.13.tgz and linux-2.3.18.tgz fromftp://linuxppc.cs.nmt.edu/pub/linuxppc/embedded/.  Untar them into twoseparate source trees.  (Note: all that's needed from 2.3.18 is themath emulator; does anyone know whether that's available separately,or could someone split it out and put it on the FTP site?)2.  Copy the arch/ppc/mathemu directory from the 2.3.18 tree to the2.2.13 tree.3.  Apply the patch (below).  Note that I am building for an MBX, so that'swhat .config gets patched for.4.  make symlinks config dep clean zImage.The following is the patch.----------------------------------------------------------------------------diff -ur linux-mpc8xx-2.2.13/arch/ppc/Makefile linux/arch/ppc/Makefile--- linux-mpc8xx-2.2.13/arch/ppc/Makefile	Wed Oct 20 15:33:30 1999+++ linux/arch/ppc/Makefile	Wed Dec  1 16:16:45 1999@@ -41,6 +41,12 @@ ARCHIVES := arch/ppc/kernel/kernel.o arch/ppc/mm/mm.o arch/ppc/lib/lib.o $(ARCHIVES) CORE_FILES := arch/ppc/kernel/kernel.o arch/ppc/mm/mm.o arch/ppc/lib/lib.o $(CORE_FILES) +ifdef CONFIG_MATH_EMULATION+SUBDIRS += arch/ppc/math-emu+ARCHIVES += arch/ppc/math-emu/math-emu.o+CORE_FILES += arch/ppc/math-emu/math-emu.o+endif+ ifdef CONFIG_XMON SUBDIRS += arch/ppc/xmon CORE_FILES += arch/ppc/xmon/x.odiff -ur linux-mpc8xx-2.2.13/arch/ppc/config.in linux/arch/ppc/config.in--- linux-mpc8xx-2.2.13/arch/ppc/config.in	Fri Oct 22 14:56:10 1999+++ linux/arch/ppc/config.in	Wed Dec  1 16:29:14 1999@@ -37,6 +37,15 @@ if [ "$CONFIG_ALL_PPC" != "y" ];then   define_bool CONFIG_MACH_SPECIFIC y fi++if [ "$CONFIG_8xx" = "y" ]; then+  bool 'Math emulation' CONFIG_MATH_EMULATION+else+  if [ "$CONFIG_PPC64" != "y" ];then+    define_bool CONFIG_6xx y+  fi+fi+ endmenu  mainmenu_option next_commentdiff -ur linux-mpc8xx-2.2.13/arch/ppc/kernel/Makefile linux/arch/ppc/kernel/Makefile--- linux-mpc8xx-2.2.13/arch/ppc/kernel/Makefile	Fri Oct 22 15:21:39 1999+++ linux/arch/ppc/kernel/Makefile	Thu Dec  2 10:34:19 1999@@ -30,7 +30,7 @@ endif  ifeq ($(CONFIG_8xx),y)-O_OBJS += m8xx_setup.o softemu8xx.o ppc8xx_pic.o+O_OBJS += m8xx_setup.o ppc8xx_pic.o ifdef CONFIG_PCI O_OBJS += qspan_pci.o endifdiff -ur linux-mpc8xx-2.2.13/arch/ppc/kernel/traps.c linux/arch/ppc/kernel/traps.c--- linux-mpc8xx-2.2.13/arch/ppc/kernel/traps.c	Fri Oct 22 14:04:09 1999+++ linux/arch/ppc/kernel/traps.c	Thu Dec  2 10:32:22 1999@@ -230,12 +230,12 @@ SoftwareEmulation(struct pt_regs *regs) { 	int	errcode;-	extern int	Soft_emulate_8xx (struct pt_regs *regs);+	extern int	do_mathemu(struct pt_regs *regs); 	extern void print_8xx_pte(struct mm_struct *, unsigned long);	  	if (user_mode(regs)) 	{-		if ((errcode = Soft_emulate_8xx(regs))) {+		if ((errcode = do_mathemu(regs))) { printk("Software Emulation %s/%d NIP: %lx *NIP: 0x%x code: %x",        current->comm,current->pid,        regs->nip, *((uint *)regs->nip), errcode);diff -ur linux-mpc8xx-2.2.13/include/asm-ppc/processor.h linux/include/asm-ppc/processor.h--- linux-mpc8xx-2.2.13/include/asm-ppc/processor.h	Fri Oct 22 16:10:02 1999+++ linux/include/asm-ppc/processor.h	Wed Dec  1 16:56:20 1999@@ -57,8 +57,33 @@ #define HID0_BTCD	(1<<1)		/* Branch target cache disable */  /* fpscr settings */-#define FPSCR_FX        (1<<31)-#define FPSCR_FEX       (1<<30)+#define FPSCR_FX        0x80000000      /* FPU exception summary */+#define FPSCR_FEX       0x40000000      /* FPU enabled exception summary */+#define FPSCR_VX        0x20000000      /* Invalid operation summary */+#define FPSCR_OX        0x10000000      /* Overflow exception summary */+#define FPSCR_UX        0x08000000      /* Underflow exception summary */+#define FPSCR_ZX        0x04000000      /* Zero-devide exception summary */+#define FPSCR_XX        0x02000000      /* Inexact exception summary */+#define FPSCR_VXSNAN    0x01000000      /* Invalid op for SNaN */+#define FPSCR_VXISI     0x00800000      /* Invalid op for Inv - Inv */+#define FPSCR_VXIDI     0x00400000      /* Invalid op for Inv / Inv */+#define FPSCR_VXZDZ     0x00200000      /* Invalid op for Zero / Zero */+#define FPSCR_VXIMZ     0x00100000      /* Invalid op for Inv * Zero */+#define FPSCR_VXVC      0x00080000      /* Invalid op for Compare */+#define FPSCR_FR        0x00040000      /* Fraction rounded */+#define FPSCR_FI        0x00020000      /* Fraction inexact */+#define FPSCR_FPRF      0x0001f000      /* FPU Result Flags */+#define FPSCR_FPCC      0x0000f000      /* FPU Condition Codes */+#define FPSCR_VXSOFT    0x00000400      /* Invalid op for software request */+#define FPSCR_VXSQRT    0x00000200      /* Invalid op for square root */+#define FPSCR_VXCVI     0x00000100      /* Invalid op for integer convert */+#define FPSCR_VE        0x00000080      /* Invalid op exception enable */+#define FPSCR_OE        0x00000040      /* IEEE overflow exception enable */+#define FPSCR_UE        0x00000020      /* IEEE underflow exception enable */+#define FPSCR_ZE        0x00000010      /* IEEE zero divide exception enable */+#define FPSCR_XE        0x00000008      /* FP inexact exception enable */+#define FPSCR_NI        0x00000004      /* FPU non IEEE-Mode */+#define FPSCR_RN        0x00000003      /* FPU rounding control */  #define _MACH_prep     1 #define _MACH_Pmac     2  /* pmac or pmac clone (non-chrp) */