Re: [patch v14 4/4] Documentation: jtag: Add ABI documentation
From: Pavel Machek <hidden>
Date: 2018-02-12 15:25:15
Also in:
linux-api, linux-arm-kernel, linux-serial, lkml, openbmc
Hi!
quoted hunk ↗ jump to hunk
@@ -0,0 +1,27 @@ +What: /dev/jtag[0-9]+ +Date: October 2017 +KernelVersion: 4.15 +Contact: oleksandrs@mellanox.com +Description: + The misc device files /dev/jtag* are the interface + between JTAG master interface and userspace. + + The ioctl(2)-based ABI is defined and documented in + [include/uapi]<linux/jtag.h>. + + The following file operations are supported: + + open(2) + The argument flag currently support only one access + mode O_RDWR. + + ioctl(2) + Initiate various actions. + See the inline documentation in [include/uapi]<linux/jtag.h> + for descriptions of all ioctls.
I tried reading the jtag.h, and am still not sure how it works. Real docs would be nice... In particular, it seems to always specify read or write actiom. Sounds like a job for read/write syscalls? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html