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<div dir="ltr">Hi Ard and Jeremy,
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<div>Let's keep _DMA regardless. Not all OSes support the IORT mechanism for DMA restrictions....</div>
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<div>A</div>
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<div class="null" dir="auto">11 января 2021 г. в 2:50:34 AM GMT-6 Ard Biesheuvel <ard.biesheuvel@arm.com> пишет:<br class="null">
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<div class="null">On 1/8/21 7:16 AM, Jeremy Linton wrote:<br class="null">
> We are going to add a _DMA() for the new controller, but<br class="null">
> it won't work right with the linux driver unless we lower<br class="null">
> the DMA zone again.<br class="null">
> <br class="null">
> Signed-off-by: Jeremy Linton <jeremy.linton@arm.com><br class="null">
> ---<br class="null">
> Platform/RaspberryPi/AcpiTables/Iort.aslc | 2 +-<br class="null">
> 1 file changed, 1 insertion(+), 1 deletion(-)<br class="null">
> <br class="null">
> diff --git a/Platform/RaspberryPi/AcpiTables/Iort.aslc b/Platform/RaspberryPi/AcpiTables/Iort.aslc<br class="null">
> index 00720194bb..f576fa3b04 100644<br class="null">
> --- a/Platform/RaspberryPi/AcpiTables/Iort.aslc<br class="null">
> +++ b/Platform/RaspberryPi/AcpiTables/Iort.aslc<br class="null">
> @@ -46,7 +46,7 @@ STATIC RPI4_IO_REMAPPING_STRUCTURE Iort = {<br class="null">
> 0x0, // AllocationHints<br class="null">
> 0x0, // Reserved<br class="null">
> 0x0, // MemoryAccessFlags<br class="null">
> - 31, // AddressSizeLimit<br class="null">
> + 30, // AddressSizeLimit<br class="null">
> }, {<br class="null">
> "\\_SB_.SCB0.XHC0" // ObjectName<br class="null">
> }<br class="null">
> <br class="null">
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If you create a new named component node here for the device(s) that<br class="null">
actually need this lower limit, you can avoid the _DMA method altogether.<br class="null">
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