Linux 5.5 Merges and News
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Linux 5.5 Can Boot The Modem Processor On Snapdragon 835 - Needed For Cell/WiFi On Qualcomm Laptops
With the Linux 5.4 cycle we saw mainline support beginning to come together for some Qualcomm ARM Linux laptops while with Linux 5.5 another milestone is being achieved. There has been out-of-tree support in the works for getting the various consumer Snapdragon laptops working with Linux while those changes are slowly getting into the mainline kernel.
The newest milestone comes with the remoteproc updates for Linux 5.5 and that is the ability to boot the modem processor on the Qualcomm MSM8998 (Snapdragon 835).
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With Approaching Another Year Closer To Year 2038, Linux 5.5 Brings More Y2038 Fixes
With approaching another year closer to the Year 2038 problem, where on 19 January 2038 the number of seconds for the Unix timestamp can no longer be stored in a signed 32-bit integer, Linux 5.5 is bringing more Y2038 preparations.
Y2038 fixes have been ongoing for years to mitigate the kernel against the Year 2038 problem, particularly for 32-bit platforms. Most of the Year 2038 preparations have been made to the Linux kernel to transition to 64-bit time_t even on 32-bit architectures, among other workarounds.
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AMD IOMMU Driver Reworked For Linux 5.5
With the IOMMU updates for the Linux 5.5 kernel there is a major rework to the AMD IOMMU driver to make use of more common DMA IOMMU code for implementing the DMA API but with an admitted risk of potential new regressions.
The AMD IOMMU Linux driver now makes use of the "dma-iommu" kernel code that allows the driver to be lightened up by several hundred lines of code thanks to the code sharing/re-use. Besides the DMA IOMMU changes, the AMD IOMMU driver now also has multiple PCI DMA alias support.
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