Messages in this thread | | | Subject | Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M | From | Christian Zigotzky <> | Date | Mon, 25 Nov 2019 17:36:17 +0100 |
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On 25 November 2019 at 08:39 am, Christoph Hellwig wrote: > On Sat, Nov 23, 2019 at 12:42:27PM +0100, Christian Zigotzky wrote: >> Hello Christoph, >> >> Please find attached the dmesg of your Git kernel. > Thanks. It looks like on your platform the swiotlb buffer isn't > actually addressable based on the bus dma mask limit, which is rather > interesting. swiotlb_init uses memblock_alloc_low to allocate the > buffer, and I'll need some help from Mike and the powerpc maintainers > to figure out how that select where to allocate the buffer from, and > how we can move it to a lower address. My gut feeling would be to try > to do what arm64 does and define a new ARCH_LOW_ADDRESS_LIMIT, preferably > without needing too much arch specific magic. > > As a quick hack can you try this patch on top of the tree from Friday? > > diff --git a/include/linux/memblock.h b/include/linux/memblock.h > index f491690d54c6..e3f95c362922 100644 > --- a/include/linux/memblock.h > +++ b/include/linux/memblock.h > @@ -344,7 +344,7 @@ static inline int memblock_get_region_node(const struct memblock_region *r) > #define MEMBLOCK_LOW_LIMIT 0 > > #ifndef ARCH_LOW_ADDRESS_LIMIT > -#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL > +#define ARCH_LOW_ADDRESS_LIMIT 0x0fffffffUL > #endif > > phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align, > Hello Christoph,
Thanks a lot for your help! I will test your patch tomorrow.
Cheers, Christian
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