| commit | 4906f80b69027ae1d7caf10e466c13ee0f7335a2 | [log] [tgz] |
|---|---|---|
| author | Jocelyn Dang <jocelyndang@google.com> | Wed Jan 16 15:52:48 2019 -0800 |
| committer | CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> | Thu Jan 17 20:01:12 2019 +0000 |
| tree | 51884a4346333089b7db1578a82cc145f765b5e5 | |
| parent | cd0e8f6e0351495173f5ff2397d1f5e4ca5f3484 [diff] |
[usb-bus] Re-add device for Device Firmware Upgrade Once we finish loading firmware onto the device, we issue a reset. If the device descriptors have changed (DFU succeeded), we need to remove the existing device and re-add it so the correct driver will be loaded. Since this bus_reinitialize_device function is called from the device manager thread, there should be no race condition of calls from the device manager trying to do bus_add_device or bus_remove_device. TEST= plug in DFU device and run usb-fwloader -d -f firmware_image Verified device appeared in lsusb ZX-3155 #comment Change-Id: Ieafe26e89e2e7c57cff9da22107b54b532653f24
Zircon is the core platform that powers the Fuchsia OS. Zircon is composed of a microkernel (source in kernel/...) as well as a small set of userspace services, drivers, and libraries (source in system/...) necessary for the system to boot, talk to hardware, load userspace processes and run them, etc. Fuchsia builds a much larger OS on top of this foundation.
The canonical Zircon Git repository is located at: https://fuchsia.googlesource.com/zircon
A read-only mirror of the code is present at: https://github.com/fuchsia-mirror/zircon
The Zircon Kernel provides syscalls to manage processes, threads, virtual memory, inter-process communication, waiting on object state changes, and locking (via futexes).
Currently there are some temporary syscalls that have been used for early bringup work, which will be going away in the future as the long term syscall API/ABI surface is finalized. The expectation is that there will be about 100 syscalls.
Zircon syscalls are generally non-blocking. The wait_one, wait_many port_wait and thread sleep being the notable exceptions.
This page is a non-comprehensive index of the zircon documentation.