Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M

Christian Zigotzky
2019-11-27T15:15:16Z

On 27 November 2019 at 07:56 am, Mike Rapoport wrote:
>
> Maybe we'll simply force bottom up allocation before calling
> swiotlb_init()? Anyway, it's the last memblock allocation.
>
>
> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
> index 62f74b1b33bd..771e6cf7e2b9 100644
> --- a/arch/powerpc/mm/mem.c
> +++ b/arch/powerpc/mm/mem.c
> @@ -286,14 +286,15 @@ void __init mem_init(void)
> /*
> * book3s is limited to 16 page sizes due to encoding this in
> * a 4-bit field for slices.
> */
> BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
>
> #ifdef CONFIG_SWIOTLB
> + memblock_set_bottom_up(true);
> swiotlb_init(0);
> #endif
>
> high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
> set_max_mapnr(max_pfn);
> memblock_free_all();
>
>
Hello Mike,

I tested the latest Git kernel with your new patch today. My PCI TV card
works without any problems.

Thanks,
Christian