自发对称破缺 issues

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                                            自发对称破缺

7a2000 evb iommu初始化失败

最新的固件配合https://github.com/chenhuacai/linux/commit/7316858fd33f2fb4e5742714676e248d63ca47e6 仍然有can't derive routing for PCI INT A的报错 https://github.com/chenhuacai/linux/issues/2 内核维护者认为prestable202308固件没有传递正确的中断信息。因此重开一个issue。

iommu 初始化失败

``` [ 0.365917] iommu: Default domain type: Translated [ 0.365921] iommu: DMA domain TLB invalidation policy: strict mode [ 3.495452] loongson-iommu 0000:00:1a.0: can't derive routing for PCI INT A [...