Posted on November 30, 2015 at 13:53hello
I make custom board with sdram and use stm32f756 chip.
Then I try to run modyfied my self version of uclinux (and u-boot) - but system hangs.
this is callstack that I build with 2 leds (early printk don't work)
/fs/super.c -> get_sb_single(...)
hangs on -> simple_set_mnt(mnt, s);
/fs/namespace.c -> void simple_set_mnt(struct vfsmount *mnt, struct super_block *sb)
hangs on -> mnt->mnt_root = dget(sb->s_root);
/include/linux/dcache.h -> static inline struct dentry *dget(struct dentry *dentry)
hangs on -> atomic_inc(&dentry->d_count);
/arch/arm/include/asm/atomic.h => atomic_inc(
hangs on - atomic_add(
Run hangs in this asm code:
static inline void atomic_add(int i, atomic_t *v)
{
unsigned long tmp;
int result;
//stm32f7_gpio_led_on(1,1);
__asm__ __volatile__(''@ atomic_add\n''
''1: ldrex %0, [%2]\n''
'' add %0, %0, %3\n''
'' strex %1, %0, [%2]\n''
'' teq %1, &sharp0\n''
'' bne 1b''
: ''=&r'' (result), ''=&r'' (tmp)
: ''r'' (&v->counter), ''Ir'' (i)
: ''cc'');
//stm32f7_gpio_led_on(1,0);
//stm32f7_gpio_led_on(0,1);
}
this function is call many times but in this order fail (hangs always on this place).
I run ram test in u-boot - but all is ok.
Does anyone have a similar problem or know what's up?
#uclinux
