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[Microblaze][PATCH] part 2

Browse source 
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
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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