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When starting at 744MHz, the Mali 450 core crashes on S805X based boards: lima d00c0000.gpu: IRQ ppmmu3 not found lima d00c0000.gpu: IRQ ppmmu4 not found lima d00c0000.gpu: IRQ ppmmu5 not found lima d00c0000.gpu: IRQ ppmmu6 not found lima d00c0000.gpu: IRQ ppmmu7 not found Internal error: synchronous external abort: 96000210 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.7.2+ #492 Hardware name: Libre Computer AML-S805X-AC (DT) pstate: 40000005 (nZcv daif -PAN -UAO) pc : lima_gp_init+0x28/0x188 ... Call trace: lima_gp_init+0x28/0x188 lima_device_init+0x334/0x534 lima_pdev_probe+0xa4/0xe4 ... Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b Reverting to a safer 666Mhz frequency on the S805X that doesn't use the GP0 PLL makes it more stable. Fixes:fd47716479("ARM64: dts: add S805X based P241 board") Fixes:0449b8e371("arm64: dts: meson: add libretech aml-s805x-ac board") Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Signed-off-by: Kevin Hilman <khilman@baylibre.com> Link: https://lore.kernel.org/r/20200618132737.14243-1-narmstrong@baylibre.com
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.