On Thursday 14 July 2016 02:29 PM, Ran Shalit wrote:
> Hello,
>
> I try to reference in kernel code mcspi status register (MCSPI_CHxSTAT
> - 0x30 offset from 0x48098000 or 0x4809A000) in kernel code, but it
> results in segmentation fault:
>
> ioaddr = ioremap_nocache(0x4809A000, SZ_4K);
> *(( unsigned int*) (ioaddr+0)) = 0x12;
> val = *(( unsigned int*) (ioaddr+0x30));
> printk("mymem 0x%x\n",val); <<-----------------
>
> I have re-checked the config of kernel, is it related to some device using spi ?
>
>
> [ 24.126739] Unhandled fault: external abort on non-linefetch (0x1028)
Usually, this means clock to the SPI controller is not enabled. Did you
do a pm_runtime_enable() and pm_runtime_get_sync() before accessing the
register?
--
Regards
Vignesh
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