From: Rich Felker <dalias@libc.org>
To: "Hans J. Koch" <hjk@hansjkoch.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH RFC] uio: allow use on nommu systems
Date: Thu, 14 Jul 2016 20:53:06 -0400 [thread overview]
Message-ID: <20160715005306.GA16591@brightrain.aerifal.cx> (raw)
mmap of uio devices does not seem to work without further
nommu-specific support, but interrupt handling already works, and
userspace drivers for nommu systems can simply use physical mmio
addresses from userspace directly anyway without mmap.
Signed-off-by: Rich Felker <dalias@libc.org>
---
I don't particularly expect this to be accepted upstream as-is, but
since we're actually trying to use the UIO subsystem on nommu (J2),
I'd like to start a discussion of what an acceptable patch would
entail.
The uio_pdrv_genirq driver was tested on J2 with this patch and
interrupt handling works as expected.
drivers/uio/Kconfig | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
index 52c98ce..387b2bb 100644
--- a/drivers/uio/Kconfig
+++ b/drivers/uio/Kconfig
@@ -1,6 +1,5 @@
menuconfig UIO
tristate "Userspace I/O drivers"
- depends on MMU
help
Enable this to allow the userspace driver core code to be
built. This code allows userspace programs easy access to
--
2.8.1
next reply other threads:[~2016-07-15 0:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-15 0:53 Rich Felker [this message]
2016-07-15 1:42 ` [PATCH RFC] uio: allow use on nommu systems Greg Kroah-Hartman
2016-07-15 1:58 ` Rich Felker
2016-07-15 11:42 ` Greg Kroah-Hartman
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