cd30b682a4
xhci_ctrl_start() published the event ring segment table, the device context base address array and the scratchpad pointers with up_flush_dcache_all(), which an architecture whose cache can only be maintained by address implements as a barrier and nothing more, so none of them reached memory. The controller then reads whatever those addresses held before, which presents as every command timing out with no events arriving. Flush each structure by address. xhci_ring_init() has the same fault from the other direction: it clears a whole ring and flushes only the link entry it writes afterwards, leaving the rest of the clearing in the cache. The controller writes into that memory itself, so a line written back later lands on top of an event somebody is waiting for. Flush the whole ring. Assisted-by: Claude:claude-opus-5 Signed-off-by: Justin Hammond <justin@dynam.ac> |
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| dummy | ||
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| include | ||
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| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
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| README.md | ||
| ReleaseNotes | ||
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.