On 1/8/21 7:16 AM, Jeremy Linton wrote:
> We are going to add a _DMA() for the new controller, but
> it won't work right with the linux driver unless we lower
> the DMA zone again.
>
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
> ---
> Platform/RaspberryPi/AcpiTables/Iort.aslc | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Platform/RaspberryPi/AcpiTables/Iort.aslc b/Platform/RaspberryPi/AcpiTables/Iort.aslc
> index 00720194bb..f576fa3b04 100644
> --- a/Platform/RaspberryPi/AcpiTables/Iort.aslc
> +++ b/Platform/RaspberryPi/AcpiTables/Iort.aslc
> @@ -46,7 +46,7 @@ STATIC RPI4_IO_REMAPPING_STRUCTURE Iort = {
> 0x0, // AllocationHints
> 0x0, // Reserved
> 0x0, // MemoryAccessFlags
> - 31, // AddressSizeLimit
> + 30, // AddressSizeLimit
> }, {
> "\\_SB_.SCB0.XHC0" // ObjectName
> }
>
If you create a new named component node here for the device(s) that
actually need this lower limit, you can avoid the _DMA method altogether.