linux-kernel - [PATCH] 0/3 - Add support for VMU flash memory and update maple bus driver on the SEGA Dreamcast

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Sat, 22 Mar 2008 17:43:25 +0000
From:	Adrian McMenamin <adrian@...golddream.dyndns.info>
To:	dwmw2 <dwmw2@...radead.org>, Greg KH <greg@...ah.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	MTD <linux-mtd@...ts.infradead.org>,
	linux-sh <linux-sh@...r.kernel.org>,
	Paul Mundt <lethal@...rs.sourceforge.net>,
	Andrew Morton <akpm@...l.org>
Subject: [PATCH] 0/3 - Add support for VMU flash memory and update maple
	bus driver on the SEGA Dreamcast

OK, second iteration of this - have added more comments and, I hope,
addressed all or nearly all of people's comments.

This adds support for the flash memory portion of the "visual memory
unit" on the SEGA Dreamcast.

Changelogs on the patches but, in summary:

On the maple bus side: 

- adds a mutex to ensure device is only addressed once per maple bus
cycle (and so avoiding corruption of the linked list of packets waiting
for transmission).

- properly uses the existing lock on the waiting packet queue and cleans
up the way the linked lists (of waiting and processed packets) are
handled.

For the device:

- relies on the mutex to ensure block reads and writes are handled
properly - normally the bus driver will unlock the mutex once a waiting
packet has been processed

- implements support for partitions. There are rumours such devices
exist - they are supported in the specification. But I've never seen
one!


There is code to follow (eventually) to implement the FAT based
filesystem used by the Dreamcast to save to these devices, but they
should be usable as small flash devices with other filesystems too.

(See http://mc.pp.se/dc/vms/flashmem.html for more details on the
hardware etc)

Signed-off-by: Adrian McMenamin <adrian@...en.demon.co.uk>


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/