Re: [PATCH 00/38] MIPS: SGI-IP27: add support for the IP35 (Bedrock hub) machines

[Thomas Bogendoerfer]

On Thu, Oct 01, 2026 at 06:11:35PM +0200, Imre Kaloz wrote:
> This series adds support for the SGI machines built around the Bedrock
> hub (IP35), such as Fuel and Tezro, to the IP27 platform code.
> 
> 
> Patches 1-17 teach the IP27 code the Bedrock hub: detection, the node
> address layout and register windows, the node id, CPU slots, memory
> banks, both PIs and the kernel load address.
> 
> Patches 18-27 add the crossbar, bridge and I/O parts of these machines:
> PXBow, XBridge, PIC and IOC4.
> 
> Patches 28-38 add the L1 system controller and what it provides, the
> Odyssey graphics widget, the KLCONFIG console and a topology package
> id per CPU.
> 
> Tested on SGI Fuel and Tezro. The NMI dump reaches the 8250 console
> only with "MIPS: SGI-IP27: print the NMI dump on an nbcon console",
> posted separately.
> 
> On IP27 (Hub) machines:
> - patch 17 moves the kernel up by 144KB, and the 144KB below it stays
>   reserved and unused;
> - with patch 21 SWIOTLB takes 64MB of node 0 on a multi-node Origin;
> - the XBridge DMA window (patch 21) and the w1 change (patch 33) do
>   nothing on a Hub with classic Bridges.
> 
> Given I have no IP27 boxes, none of this was booted on one.
> ip27_defconfig and ip30_defconfig build at every patch.
> 
> An XBridge or PIC on a Bedrock hub takes its board setup from the
> first board part number the L1 reports that the setup table knows
> (patch 30), so on a machine with several bricks every such bridge gets
> that one board's setup.
> 
> Patch 36 registers the Odyssey graphics widget as the "sgi-odyssey"
> platform device used by the Odyssey DRM driver, a separate series.

thank you for your patches, I'm going on vacation tomorrow for 2 weeks,
so I'll look at them after it.

Thomas.

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