with kernel 2.6.35, on beagle xm rev C, I found a situation that hangs the
kernel here:
if I do nothing in map_io, which be called just before local_flush_tlb_all,
kernel will hang up there.
setup_arch->paging_init->devicemaps_init last two lines
static inline void local_flush_tlb_all(void)
{
const int zero = 0;
const unsigned int __tlb_flag = __cpu_tlb_flags;
if (tlb_flag(TLB_WB))
dsb();
if (tlb_flag(TLB_V3_FULL))
asm("mcr p15, 0, %0, c6, c0, 0" : : "r" (zero) : "cc");
if (tlb_flag(TLB_V4_U_FULL | TLB_V6_U_FULL))
asm("mcr p15, 0, %0, c8, c7, 0" : : "r" (zero) : "cc"); //
kernel hangs at this line
if (tlb_flag(TLB_V4_D_FULL | TLB_V6_D_FULL))
asm("mcr p15, 0, %0, c8, c6, 0" : : "r" (zero) : "cc");
if (tlb_flag(TLB_V4_I_FULL | TLB_V6_I_FULL))
asm("mcr p15, 0, %0, c8, c5, 0" : : "r" (zero) : "cc");
if (tlb_flag(TLB_V7_UIS_FULL))
asm("mcr p15, 0, %0, c8, c3, 0" : : "r" (zero) : "cc");
if (tlb_flag(TLB_BTB)) {
/* flush the branch target cache */
asm("mcr p15, 0, %0, c7, c5, 6" : : "r" (zero) : "cc");
dsb();
isb();
}
if (tlb_flag(TLB_V7_IS_BTB)) {
/* flush the branch target cache */
asm("mcr p15, 0, %0, c7, c1, 6" : : "r" (zero) : "cc");
dsb();
isb();
}
}
but if I mapped CPU L4 peripheral to some virtual address in map_io, this
local_flush_tlb_all
call will run correctly.
I have enabled early printk in kernel which I use it to locate where kernel
stopped.
so my question is what effect will mapping L4 peripheral do to
local_flush_tlb_all?
thanks
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