diff --git a/src/include/cpu/amd/sc520.h b/src/include/cpu/amd/sc520.h
new file mode 100644
index 0000000..b0fa568
--- /dev/null
+++ b/src/include/cpu/amd/sc520.h
@@ -0,0 +1,311 @@
+/* handy dandy stuff for the sc520 MMCR */
+/* default location of the MMCR */
+#define MMCR 0xfffef000
+
+/* the PAR register struct definition, the location in memory, 
+  * and a handy pointer for you to use 
+  */
+
+struct parreg {
+	unsigned long reg[16];
+};
+
+#define PARREG (struct parreg *)0xfffef088
+//static volatile struct parreg *par = PARREG;
+
+
+#define MMCRPIC (struct mmcrpic *) 0xfffefd00
+//static volatile struct mmcrpic *pic = MMCRPIC;
+
+#define M_GINT_MODE     1
+#define M_S1_MODE       2
+#define M_S2_MODE       4
+
+
+/* here is the real mmcr struct */
+
+struct memregs {
+	/* make these shorts, we are lsb and the hardware seems to like it 
+	 * better
+	 */
+	unsigned short drcctl;
+	unsigned short drctmctl;
+	unsigned short drccfg;
+	unsigned char pad1[2];
+	unsigned char drcbendadr[4];
+	unsigned char pad2[4];
+	unsigned char eccctl;
+	unsigned char eccsta;
+	unsigned char eccckbpos;
+	unsigned char ecccktest;
+	unsigned long eccsbadd;
+	unsigned long eccmbadd;
+	unsigned char pad3[18];
+};
+struct dbctl {
+	unsigned char dbctl;
+	unsigned char pad4[15];
+};
+	
+struct romregs {
+	unsigned char bootcs;
+	unsigned char pad5[3];
+	unsigned char romcs1;
+	unsigned char pad6[1];
+	unsigned char romcs2;
+	unsigned char pad7[6];
+};
+	
+
+struct hostbridge {
+	unsigned short ctl;
+	unsigned short tgtirqctl;
+	unsigned short tgtirqsta;
+	unsigned short mstirqctl;
+	unsigned short mstirqsta;
+	unsigned char pad8[2];
+	unsigned long mstintadd;
+};
+
+struct sysarb {
+	unsigned char ctl;
+	unsigned char sta;
+	unsigned char menb;
+	unsigned long prictl;
+	unsigned char pad9[8];
+};
+
+struct sysmap {
+	unsigned char adddecctl;
+	unsigned char pada[1];
+	unsigned short wpvsta;
+	unsigned char padb[4];
+	unsigned long par[16];
+	unsigned char padc[0xb38];
+};
+
+struct gpctl {
+	unsigned char gpecho;
+	unsigned char gpcsdw;
+	unsigned char gpcsqual;
+	unsigned char padd[5];
+	unsigned char gpcsrt;
+	unsigned char gpcspw;
+	unsigned char gpcsoff;
+	unsigned char gprdw;
+	unsigned char gprdoff;
+	unsigned char gpwrw;
+	unsigned char gpwroff;
+	unsigned char gpalew;
+	unsigned char gpaleoff;
+	unsigned char pade[15];
+};
+
+struct pio {
+	unsigned short pfs15_0;
+	unsigned short pfs31_16;
+	unsigned char cspfs;
+	unsigned char padf[1];
+	unsigned char clksel;
+	unsigned char padg[1];
+	unsigned short dsctl;
+	unsigned short dir15_0;
+	unsigned short dir31_16;
+	unsigned short padh;
+	unsigned short data15_0;
+	unsigned short data31_16;
+	unsigned short set15_0;
+	unsigned short set31_16;
+	unsigned short clr15_0;
+	unsigned short clr31_16;
+	unsigned char padi[0x24];
+};
+
+struct swtmr {
+	unsigned short swtmrmilli;
+	unsigned short swtmrmicro;
+	unsigned char swtmrcfg;
+	unsigned char padj[0xb];
+};
+
+struct gptmr {
+	unsigned short ctl;
+	unsigned short cnt;
+	unsigned short maxcmpa, maxcmpb;
+};
+
+struct gptimers {
+	unsigned char status;
+	unsigned char pad;
+	struct gptmr timer[2];
+	/* yes, they REALLY DID make timer 2 different. */
+	/* yikes */
+	unsigned short ctl2;
+	unsigned short cnt2;
+	unsigned char paddumb[8];
+	unsigned short maxcmpa2;
+
+	unsigned char pada[0x20];
+};
+
+struct watchdog {
+	unsigned short ctl;
+	unsigned short cntll;
+        unsigned short cntlh;
+	unsigned char pad[10];
+};
+
+struct uart {
+	unsigned char ctl, sta, fcrshad, pad;
+};
+
+struct uarts {
+	struct uart uart[2];
+	unsigned char pad[8];
+};
+
+struct ssi {
+	unsigned char ctl, xmit, cmd, sta, rcv;
+	unsigned char pad[0x2b];
+};
+
+	
+/* interrupt control registers */
+/* defined this way for portability. Shame we can't just use plan 9 c. */
+struct pic {
+	unsigned char pcicr;
+	unsigned char pad1;
+	unsigned char mpicmode;
+	unsigned char sl1picmode;
+	unsigned char sl2picmode;
+	unsigned char pad2[3];
+	unsigned char swint16_1;
+	unsigned char pad3;
+	unsigned char swint22_17;
+	unsigned char pad4[5];
+	unsigned short intpinpol;
+	unsigned char pad5[2];
+	unsigned char pichostmap;
+	unsigned char pad6[3];
+	unsigned char eccmap;
+	unsigned char pad7[1];
+	unsigned char gptmr0map;
+	unsigned char gptmr1map;
+	unsigned char gptmr2map;
+	unsigned char pad8[3];
+	unsigned char pit0map;
+	unsigned char pit1map;
+	unsigned char pit2map;
+	unsigned char pad9[5];
+	unsigned char uart1map;
+	unsigned char uart2map;
+	unsigned char pad99[6];
+	unsigned char pciintamap;
+	unsigned char pciintbmap;
+	unsigned char pciintcmap;
+	unsigned char pciintdmap;
+	unsigned char pad10[12];
+	unsigned char dmabcintmap;
+	unsigned char ssimap;
+	unsigned char wdtmap;
+	unsigned char rtcmap;
+	unsigned char wpvmap;
+	unsigned char icemap;
+	unsigned char ferrmap;
+	unsigned char pad11[9];
+	unsigned char gp0imap;
+	unsigned char gp1imap;
+	unsigned char gp2imap;
+	unsigned char gp3imap;
+	unsigned char gp4imap;
+	unsigned char gp5imap;
+	unsigned char gp6imap;
+	unsigned char gp7imap;
+	unsigned char gp8imap;
+	unsigned char gp9imap;
+	unsigned char gp10imap;
+	unsigned char padend[0x14];
+}; 
+
+struct reset {
+	unsigned char sysinfo;
+	unsigned char pad1;
+	unsigned char rescfg;
+	unsigned char pad2;
+	unsigned char ressta;
+	unsigned char pad3[0xb];
+};
+
+struct dmacontrol {
+	unsigned char ctl;
+	unsigned char mmio;
+	unsigned short extchanmapa;
+	unsigned short extchanmapb;
+	unsigned char extpg0;
+	unsigned char extpg1;
+	unsigned char extpg2;
+	unsigned char extpg3;
+	unsigned char extpg5;
+	unsigned char extpg6;
+	unsigned char extpg7;
+	unsigned char pad[3];
+	unsigned char exttc3;
+	unsigned char exttc5;
+	unsigned char exttc6;
+	unsigned char exttc7;
+	unsigned char pad1[4];
+	unsigned char bcctl;
+	unsigned char bcsta;
+	unsigned char bsintenb;
+	unsigned char bcval;
+	unsigned char pad2[4];
+	unsigned short nxtaddl3;
+	unsigned short nxtaddh3;
+	unsigned short nxtaddl5;
+	unsigned short nxtaddh5;
+	unsigned short nxtaddl6;
+	unsigned short nxtaddh6;
+	unsigned short nxtaddl7;
+	unsigned short nxtaddh7;
+	unsigned short nxtttcl3;
+	unsigned char nxtttch3;
+	unsigned char pad3;
+	unsigned short nxtttcl5;
+	unsigned char nxtttch5;
+	unsigned char pad5;
+	unsigned short nxtttcl6;
+	unsigned char nxtttch6;
+	unsigned char pad6;
+	unsigned short nxtttcl7;
+	unsigned char nxtttch7;
+	unsigned char pad7;
+};
+
+
+	
+
+struct mmcr {
+	unsigned short revid;
+	unsigned char cpucontrol;
+	unsigned char pad1[11];
+	struct memregs memregs;
+	struct dbctl dbctl;
+	struct romregs romregs;
+	struct hostbridge hostbridge;
+	struct sysarb sysarb;
+	struct sysmap sysmap;
+	struct gpctl gpctl;
+	struct pio pio;
+	struct swtmr swtmr;
+	struct gptimers gptimers;
+	struct watchdog watchdog;
+	struct uarts uarts;
+	struct ssi ssi;
+	struct pic pic;
+	struct reset reset;
+	struct dmacontrol dmacontrol;
+	unsigned char padend[0x23d];
+};
+
+
+#define MMCRDEFAULT (struct mmcr *) 0xfffef000