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[Microblaze][PATCH] part 2 

timer support
interrupt controller support
flash support
ethernet support
cache support
board information support
env support
booting image support

adding support for Xilinx ML401
This commit is contained in:
Michal Simek 2007-03-11 13:48:24 +01:00
parent 76316a318d
commit cfc67116a7
13 changed files with 518 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
MAKEALL
View File

@ -292,7 +292,7 @@ LIST_nios2=" \
#########################################################################
LIST_microblaze=" \
suzaku
suzaku ml401
"
#########################################################################

6
Makefile
View File

@ -2304,6 +2304,11 @@ suzaku_config: unconfig
@echo "#define CONFIG_SUZAKU 1" >> $(obj)include/config.h
@$(MKCONFIG) -a $(@:_config=) microblaze microblaze suzaku AtmarkTechno
ml401_config: unconfig
@ >include/config.h
@echo "#define CONFIG_ML401 1" >> include/config.h
@./mkconfig -a $(@:_config=) microblaze microblaze ml401 xilinx
#########################################################################
## Blackfin
#########################################################################
@ -2381,3 +2386,4 @@ backup:
gtar --force-local -zcvf `date "+$$F-%Y-%m-%d-%T.tar.gz"` $$F
#########################################################################

2
board/AtmarkTechno/suzaku/u-boot.lds
View File

@ -61,6 +61,6 @@ SECTIONS
{
__bss_start = .;
*(.bss)
__bss_start = .;
__bss_end = .;
}
}

4
board/xilinx/xilinx_enet/emac_adapter.c
View File

@ -147,7 +147,11 @@ eth_rx(void)
RecvFrameLength = PKTSIZE;
Result = XEmac_PollRecv(&Emac, (u8 *) etherrxbuff, &RecvFrameLength);
if (Result == XST_SUCCESS) {
#ifndef CONFIG_MICROBLAZE
NetReceive((uchar *)etherrxbuff, RecvFrameLength);
#else
NetReceive(etherrxbuff, RecvFrameLength);
#endif
return (1);
} else {
return (0);

26
common/cmd_bdinfo.c
View File

@ -180,6 +180,32 @@ int do_bdinfo ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
return 0;
}
#elif defined(CONFIG_MICROBLAZE) /* ! PPC, which leaves Microblaze */
int do_bdinfo ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
int i;
bd_t *bd = gd->bd;
print_num ("mem start ", (ulong)bd->bi_memstart);
print_num ("mem size ", (ulong)bd->bi_memsize);
print_num ("flash start ", (ulong)bd->bi_flashstart);
print_num ("flash size ", (ulong)bd->bi_flashsize);
print_num ("flash offset ", (ulong)bd->bi_flashoffset);
#if defined(CFG_SRAM_BASE)
print_num ("sram start ", (ulong)bd->bi_sramstart);
print_num ("sram size ", (ulong)bd->bi_sramsize);
#endif
#if defined(CFG_CMD_NET)
puts ("ethaddr =");
for (i=0; i<6; ++i) {
printf ("%c%02X", i ? ':' : ' ', bd->bi_enetaddr[i]);
}
puts ("\nip_addr = ");
print_IPaddr (bd->bi_ip_addr);
#endif
printf ("\nbaudrate = %d bps\n", (ulong)bd->bi_baudrate);
return 0;
}
#else /* ! PPC, which leaves MIPS */

8
common/env_common.c
View File

@ -222,6 +222,14 @@ void env_relocate (void)
DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
#endif
#ifdef CONFIG_MICROBLAZE
/*
* FIXME MALLOC error for Microblaze - error malloc return
* bad value. Correct value is CFG_MONITOR_BASE - CFG_MALLOC_LEN.
*/
env_ptr = (env_t *)CFG_MONITOR_BASE;
DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
#endif
/*
* After relocation to RAM, we can always use the "memory" functions
*/

3
cpu/microblaze/Makefile
View File

@ -26,7 +26,8 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib$(CPU).a
START = start.o
COBJS = cpu.o interrupts.o
SOBJS = dcache.o icache.o irq.o disable_int.o enable_int.o
COBJS = cpu.o interrupts.o cache.o exception.o timer.o
SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS))

182
cpu/microblaze/interrupts.c
View File

@ -1,6 +1,8 @@
/*
* (C) Copyright 2007 Michal Simek
* (C) Copyright 2004 Atmark Techno, Inc.
*
* Michal SIMEK <monstr@monstr.eu>
* Yasushi SHOJI <yashi@atmark-techno.com>
*
* See file CREDITS for list of people who contributed to this
@ -13,7 +15,7 @@
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
@ -22,11 +24,185 @@
* MA 02111-1307 USA
*/
void enable_interrupts(void)
#include <common.h>
#include <command.h>
#include <asm/microblaze_intc.h>
#undef DEBUG_INT
extern void microblaze_disable_interrupts (void);
extern void microblaze_enable_interrupts (void);
void enable_interrupts (void)
{
microblaze_enable_interrupts ();
}
int disable_interrupts(void)
int disable_interrupts (void)
{
microblaze_disable_interrupts ();
return 0;
}
#ifdef CFG_INTC_0
#ifdef CFG_TIMER_0
extern void timer_init (void);
#endif
static struct irq_action vecs[CFG_INTC_0_NUM];
/* mapping structure to interrupt controller */
microblaze_intc_t *intc = (microblaze_intc_t *) (CFG_INTC_0_ADDR);
/* default handler */
void def_hdlr (void)
{
puts ("def_hdlr\n");
}
void enable_one_interrupt (int irq)
{
int mask;
int offset = 1;
offset <<= irq;
mask = intc->ier;
intc->ier = (mask | offset);
#ifdef DEBUG_INT
printf ("Enable one interrupt irq %x - mask %x,ier %x\n", offset, mask,
intc->ier);
printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
intc->iar, intc->mer);
#endif
}
void disable_one_interrupt (int irq)
{
int mask;
int offset = 1;
offset <<= irq;
mask = intc->ier;
intc->ier = (mask & ~offset);
#ifdef DEBUG_INT
printf ("Disable one interrupt irq %x - mask %x,ier %x\n", irq, mask,
intc->ier);
printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
intc->iar, intc->mer);
#endif
}
/* adding new handler for interrupt */
void install_interrupt_handler (int irq, interrupt_handler_t * hdlr, void *arg)
{
struct irq_action *act;
/* irq out of range */
if ((irq < 0) || (irq > CONFIG_XILINX_INTC_0_NUM_INTR_INPUTS)) {
puts ("IRQ out of range\n");
return;
}
act = &vecs[irq];
if (hdlr) { /* enable */
act->handler = hdlr;
act->arg = arg;
act->count = 0;
enable_one_interrupt (irq);
} else { /* disable */
act->handler = (interrupt_handler_t *) def_hdlr;
act->arg = (void *)irq;
disable_one_interrupt (irq);
}
}
/* initialization interrupt controller - hardware */
void intc_init (void)
{
intc->mer = 0;
intc->ier = 0;
intc->iar = 0xFFFFFFFF;
/* XIntc_Start - hw_interrupt enable and all interrupt enable */
intc->mer = 0x3;
#ifdef DEBUG_INT
printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
intc->iar, intc->mer);
#endif
}
int interrupts_init (void)
{
int i;
/* initialize irq list */
for (i = 0; i < CONFIG_XILINX_INTC_0_NUM_INTR_INPUTS; i++) {
vecs[i].handler = (interrupt_handler_t *) def_hdlr;
vecs[i].arg = (void *)i;
vecs[i].count = 0;
}
/* initialize intc controller */
intc_init ();
#ifdef CFG_TIMER_0
timer_init ();
#endif
enable_interrupts ();
return 0;
}
void interrupt_handler (void)
{
int irqs;
irqs = (intc->isr & intc->ier); /* find active interrupt */
#ifdef DEBUG_INT
printf ("INTC isr %x, ier %x, iar %x, mer %x\n", intc->isr, intc->ier,
intc->iar, intc->mer);
printf ("Interrupt handler on %x line, r14 %x\n", irqs, value);
#endif
struct irq_action *act = vecs;
while (irqs) {
if (irqs & 1) {
#ifdef DEBUG_INT
printf
("Jumping to interrupt handler rutine addr %x,count %x,arg %x\n",
act->handler, act->count, act->arg);
#endif
act->handler (act->arg);
act->count++;
}
irqs >>= 1;
act++;
}
intc->iar = 0xFFFFFFFF; /* erase all events */
#ifdef DEBUG
printf ("Dump INTC reg, isr %x, ier %x, iar %x, mer %x\n", intc->isr,
intc->ier, intc->iar, intc->mer);
printf ("Interrupt handler on %x line, r14\n", irqs);
#endif
}
#endif
#if (CONFIG_COMMANDS & CFG_CMD_IRQ)
#ifdef CFG_INTC_0
int do_irqinfo (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
int i;
struct irq_action *act = vecs;
puts ("\nInterrupt-Information:\n\n"
"Nr Routine Arg Count\n"
"-----------------------------\n");
for (i = 0; i < CONFIG_XILINX_INTC_0_NUM_INTR_INPUTS; i++) {
if (act->handler != (interrupt_handler_t*) def_hdlr) {
printf ("%02d %08lx %08lx %d\n", i,
(int)act->handler, (int)act->arg, act->count);
}
act++;
}
puts ("\n");
return (0);
}
#else
int do_irqinfo (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
puts ("Undefined interrupt controller\n");
}
#endif
#endif /* CONFIG_COMMANDS & CFG_CMD_IRQ */

62
cpu/microblaze/start.S
View File

@ -1,6 +1,8 @@
/*
* (C) Copyright 2007 Michal Simek
* (C) Copyright 2004 Atmark Techno, Inc.
*
* Michal SIMEK <monstr@monstr.eu>
* Yasushi SHOJI <yashi@atmark-techno.com>
*
* See file CREDITS for list of people who contributed to this
@ -13,7 +15,7 @@
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
@ -27,10 +29,62 @@
.text
.global _start
_start:
mts rmsr, r0 /* disable cache */
addi r1, r0, CFG_INIT_SP_OFFSET
/* add opcode instruction for 32bit jump - 2 instruction imm & brai*/
addi r6, r0, 0xb000 /* hex b000 opcode imm */
bslli r6, r6, 16 /* shift */
swi r6, r0, 0x0 /* reset address */
swi r6, r0, 0x8 /* user vector exception */
swi r6, r0, 0x10 /* interrupt */
swi r6, r0, 0x20 /* hardware exception */
addi r1, r0, CFG_SDRAM_BASE /* init stack pointer */
addi r1, r1, CFG_SDRAM_SIZE /* set sp to high up */
addi r6, r0, 0xb808 /* hew b808 opcode brai*/
bslli r6, r6, 16
swi r6, r0, 0x4 /* reset address */
swi r6, r0, 0xC /* user vector exception */
swi r6, r0, 0x14 /* interrupt */
swi r6, r0, 0x24 /* hardware exception */
#ifdef CFG_RESET_ADDRESS
/* reset address */
addik r6, r0, CFG_RESET_ADDRESS
sw r6, r1, r0
lhu r7, r1, r0
shi r7, r0, 0x2
shi r6, r0, 0x6
#endif
#ifdef CFG_USR_EXCEP
/* user_vector_exception */
addik r6, r0, _exception_handler
sw r6, r1, r0
lhu r7, r1, r0
shi r7, r0, 0xa
shi r6, r0, 0xe
#endif
#ifdef CFG_INTC_0
/* interrupt_handler */
addik r6, r0, _interrupt_handler
sw r6, r1, r0
lhu r7, r1, r0
shi r7, r0, 0x12
shi r6, r0, 0x16
#endif
/* hardware exception */
addik r6, r0, _hw_exception_handler
sw r6, r1, r0
lhu r7, r1, r0
shi r7, r0, 0x22
shi r6, r0, 0x26
/* enable instruction and data cache */
mfs r12, rmsr
ori r12, r12, 0xa0
mts rmsr, r12
/* jumping to board_init */
brai board_init
1: bri 1b

95
lib_microblaze/board.c
View File

@ -1,6 +1,8 @@
/*
* (C) Copyright 2007 Michal Simek
* (C) Copyright 2004 Atmark Techno, Inc.
*
* Michal SIMEK <monstr@monstr.eu>
* Yasushi SHOJI <yashi@atmark-techno.com>
*
* See file CREDITS for list of people who contributed to this
@ -13,7 +15,7 @@
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
@ -30,8 +32,18 @@
DECLARE_GLOBAL_DATA_PTR;
const char version_string[] =
U_BOOT_VERSION" (" __DATE__ " - " __TIME__ ")";
const char version_string[] = U_BOOT_VERSION " (" __DATE__ " - " __TIME__ ")";
#ifdef CFG_GPIO_0
extern int gpio_init (void);
#endif
#ifdef CFG_INTC_0
extern int interrupts_init (void);
#endif
#if (CONFIG_COMMANDS & CFG_CMD_NET)
extern int eth_init (bd_t * bis);
extern int getenv_IPaddr (char *);
#endif
/*
* Begin and End of memory area for malloc(), and current "brk"
@ -40,6 +52,18 @@ static ulong mem_malloc_start;
static ulong mem_malloc_end;
static ulong mem_malloc_brk;
/*
* The Malloc area is immediately below the monitor copy in DRAM
* aka CFG_MONITOR_BASE - Note there is no need for reloc_off
* as our monitory code is run from SDRAM
*/
static void mem_malloc_init (void)
{
mem_malloc_end = CFG_MONITOR_BASE + CFG_MONITOR_LEN;
mem_malloc_start = CFG_MONITOR_BASE;
mem_malloc_brk = mem_malloc_start;
memset ((void *)mem_malloc_start, 0, mem_malloc_end - mem_malloc_start);
}
void *sbrk (ptrdiff_t increment)
{
@ -50,7 +74,7 @@ void *sbrk (ptrdiff_t increment)
return (NULL);
}
mem_malloc_brk = new;
return ((void *) old);
return ((void *)old);
}
/*
@ -68,24 +92,36 @@ void *sbrk (ptrdiff_t increment)
typedef int (init_fnc_t) (void);
init_fnc_t *init_sequence[] = {
serial_init, /* serial communications setup */
env_init,
serial_init,
#ifdef CFG_GPIO_0
gpio_init,
#endif
#ifdef CFG_INTC_0
interrupts_init,
#endif
NULL,
};
void board_init(void)
void board_init (void)
{
bd_t *bd;
init_fnc_t **init_fnc_ptr;
/* Pointer is writable since we allocated a register for it. */
gd = (gd_t *)CFG_GBL_DATA_OFFSET;
memset((void *)gd, 0, CFG_GBL_DATA_SIZE);
gd->bd = (bd_t *)(gd+1); /* At end of global data */
gd = (gd_t *) CFG_GBL_DATA_OFFSET;
#if (CONFIG_COMMANDS & CFG_CMD_FLASH)
ulong flash_size = 0;
#endif
asm ("nop"); /* FIXME gd is not initialize - wait */
memset ((void *)gd, 0, CFG_GBL_DATA_SIZE);
gd->bd = (bd_t *) (gd + 1); /* At end of global data */
gd->baudrate = CONFIG_BAUDRATE;
bd = gd->bd;
bd->bi_baudrate = CONFIG_BAUDRATE;
bd->bi_memstart = CFG_SDRAM_BASE;
bd->bi_memsize = CFG_SDRAM_SIZE;
/* Initialise malloc() area */
mem_malloc_init ();
for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
WATCHDOG_RESET ();
@ -94,6 +130,37 @@ void board_init(void)
}
}
#if (CONFIG_COMMANDS & CFG_CMD_FLASH)
bd->bi_flashstart = CFG_FLASH_BASE;
if (0 < (flash_size = flash_init ())) {
bd->bi_flashsize = flash_size;
bd->bi_flashoffset = CFG_FLASH_BASE + flash_size;
} else {
puts ("Flash init FAILED");
bd->bi_flashstart = 0;
bd->bi_flashsize = 0;
bd->bi_flashoffset = 0;
}
#endif
#if (CONFIG_COMMANDS & CFG_CMD_NET)
char *s, *e;
int i;
/* board MAC address */
s = getenv ("ethaddr");
for (i = 0; i < 6; ++i) {
bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
if (s)
s = (*e) ? e + 1 : e;
}
/* IP Address */
bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
eth_init (bd);
#endif
/* relocate environment function pointers etc. */
env_relocate ();
/* main_loop */
for (;;) {
WATCHDOG_RESET ();
@ -104,5 +171,5 @@ void board_init(void)
void hang (void)
{
puts ("### ERROR ### Please RESET the board ###\n");
for (;;);
for (;;) ;
}

146
lib_microblaze/microblaze_linux.c
View File

@ -1,6 +1,8 @@
/*
* (C) Copyright 2007 Michal Simek
* (C) Copyright 2004 Atmark Techno, Inc.
*
* Michal SIMEK <monstr@monstr.eu>
* Yasushi SHOJI <yashi@atmark-techno.com>
*
* See file CREDITS for list of people who contributed to this
@ -13,7 +15,7 @@
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
@ -24,8 +26,146 @@
#include <common.h>
#include <command.h>
#include <image.h>
#include <zlib.h>
#include <asm/byteorder.h>
void do_bootm_linux(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[],
ulong addr, ulong *len_ptr, int verify)
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_SHOW_BOOT_PROGRESS
# include <status_led.h>
# define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg)
#else
# define SHOW_BOOT_PROGRESS(arg)
#endif
extern image_header_t header; /* from cmd_bootm.c */
/*cmd_boot.c*/
extern int do_reset (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[]);
void do_bootm_linux (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[],
ulong addr, ulong * len_ptr, int verify)
{
ulong len = 0, checksum;
ulong initrd_start, initrd_end;
ulong data;
/* First parameter is mapped to $r5 for kernel boot args */
void (*theKernel) (char *);
image_header_t *hdr = &header;
char *commandline = getenv ("bootargs");
int i;
theKernel = (void (*)(char *))ntohl (hdr->ih_ep);
/* Check if there is an initrd image */
if (argc >= 3) {
SHOW_BOOT_PROGRESS (9);
addr = simple_strtoul (argv[2], NULL, 16);
printf ("## Loading Ramdisk Image at %08lx ...\n", addr);
/* Copy header so we can blank CRC field for re-calculation */
memcpy (&header, (char *)addr, sizeof (image_header_t));
if (ntohl (hdr->ih_magic) != IH_MAGIC) {
printf ("Bad Magic Number\n");
SHOW_BOOT_PROGRESS (-10);
do_reset (cmdtp, flag, argc, argv);
}
data = (ulong) & header;
len = sizeof (image_header_t);
checksum = ntohl (hdr->ih_hcrc);
hdr->ih_hcrc = 0;
if (crc32 (0, (char *)data, len) != checksum) {
printf ("Bad Header Checksum\n");
SHOW_BOOT_PROGRESS (-11);
do_reset (cmdtp, flag, argc, argv);
}
SHOW_BOOT_PROGRESS (10);
print_image_hdr (hdr);
data = addr + sizeof (image_header_t);
len = ntohl (hdr->ih_size);
if (verify) {
ulong csum = 0;
printf (" Verifying Checksum ... ");
csum = crc32 (0, (char *)data, len);
if (csum != ntohl (hdr->ih_dcrc)) {
printf ("Bad Data CRC\n");
SHOW_BOOT_PROGRESS (-12);
do_reset (cmdtp, flag, argc, argv);
}
printf ("OK\n");
}
SHOW_BOOT_PROGRESS (11);
if ((hdr->ih_os != IH_OS_LINUX) ||
(hdr->ih_arch != IH_CPU_MICROBLAZE) ||
(hdr->ih_type != IH_TYPE_RAMDISK)) {
printf ("No Linux Microblaze Ramdisk Image\n");
SHOW_BOOT_PROGRESS (-13);
do_reset (cmdtp, flag, argc, argv);
}
/*
* Now check if we have a multifile image
*/
} else if ((hdr->ih_type == IH_TYPE_MULTI) && (len_ptr[1])) {
ulong tail = ntohl (len_ptr[0]) % 4;
SHOW_BOOT_PROGRESS (13);
/* skip kernel length and terminator */
data = (ulong) (&len_ptr[2]);
/* skip any additional image length fields */
for (i = 1; len_ptr[i]; ++i)
data += 4;
/* add kernel length, and align */
data += ntohl (len_ptr[0]);
if (tail) {
data += 4 - tail;
}
len = ntohl (len_ptr[1]);
} else {
/*
* no initrd image
*/
SHOW_BOOT_PROGRESS (14);
data = 0;
}
#ifdef DEBUG
if (!data) {
printf ("No initrd\n");
}
#endif
if (data) {
initrd_start = data;
initrd_end = initrd_start + len;
} else {
initrd_start = 0;
initrd_end = 0;
}
SHOW_BOOT_PROGRESS (15);
#ifdef DEBUG
printf ("## Transferring control to Linux (at address %08lx) ...\n",
(ulong) theKernel);
#endif
theKernel (commandline);
}

9
lib_microblaze/time.c
View File

@ -1,6 +1,8 @@
/*
* (C) Copyright 2007 Michal Simek
* (C) Copyright 2004 Atmark Techno, Inc.
*
* Michal SIMEK <monstr@monstr.eu>
* Yasushi SHOJI <yashi@atmark-techno.com>
*
* See file CREDITS for list of people who contributed to this
@ -22,6 +24,11 @@
* MA 02111-1307 USA
*/
void udelay(unsigned long usec)
#include <common.h>
void udelay (unsigned long usec)
{
int i;
i = get_timer (0);
while ((get_timer (0) - i) < (usec / 1000)) ;
}

2
microblaze_config.mk
View File

@ -22,7 +22,7 @@
# MA 02111-1307 USA
#
PLATFORM_CPPFLAGS += -ffixed-r31
PLATFORM_CPPFLAGS += -ffixed-r31 -D__microblaze__
ifdef CONFIG_MICROBLAZE_HARD_MULT
PLATFORM_CPPFLAGS += -mno-xl-soft-mul