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From: ben@decadent.org.uk (Ben Hutchings)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 21/21] ARM: Kirkwood: Remove DT support
Date: Fri, 21 Feb 2014 19:51:51 +0000	[thread overview]
Message-ID: <1393012311.15717.52.camel@deadeye.wl.decadent.org.uk> (raw)
In-Reply-To: <1725547.sbei6Aef3A@wuerfel>

On Fri, 2014-02-21 at 14:07 +0100, Arnd Bergmann wrote:
> On Friday 21 February 2014 01:47:31 Ben Hutchings wrote:
> > On Thu, 2014-02-20 at 16:19 +0100, Arnd Bergmann wrote:
> > > On Thursday 20 February 2014 14:21:10 Ian Campbell wrote:
> >
> > > For all I know, the only interesting ixp4xx platforms are the consumer
> > > products listed on http://www.nslu2-linux.org/, the other ones you support
> > > are development boards that tend to exist only in very small quantities.
> > > 
> > > The main limitation would be the amount of installed RAM, which is
> > > either 32MB or 64MB depending on the machine for these. Running a
> > > modern Debian with these constraints is probably possible but
> > > doesn't sound like fun. 
> > 
> > Our most pressing constraint has actually been the size of the kernel
> > partition in flash, which is only ~1.4 MB on some of the iop32x and
> > ixp4xx machines (and ~1.5 MB on one of the orion5x machines).  We've
> > modularised as much as possible and turned off some of the features that
> > are otherwise standard across all Debian architectures.
> 
> Makes sense. I'm impressed you actually manage to get a modern kernel
> in 1.5MB and have it boot up a (mostly) full distro. I think we have
> in the past dropped a subarchitecture from the kernel when it turned
> out its defconfig could no longer fit within the 2MB of flash it
> has.
[...]

These are the changes we make for orion5x:

# CONFIG_KPROBES is not set
# CONFIG_CRYPTO_FIPS is not set
# CONFIG_VGA_ARB is not set
# CONFIG_AUDITSYSCALL is not set
# CONFIG_CHECKPOINT_RESTORE is not set
CONFIG_CC_OPTIMIZE_FOR_SIZE=y
#. Saves about 17K, and none of the quirks are likely to be needed
# CONFIG_PCI_QUIRKS is not set
# CONFIG_FTRACE is not set
# CONFIG_KSM is not set
CONFIG_IPV6=m
# CONFIG_NET_MPLS_GSO is not set
# CONFIG_NETLINK_MMAP is not set
# CONFIG_SECURITY_YAMA is not set
# CONFIG_RD_LZ4 is not set

For ixp4xx we have these as well:

#. Saves about 5K
# CONFIG_USER_NS is not set
#. Saves about 7K
# CONFIG_MEMCG is not set
#. Saves about 3K
# CONFIG_BPF_JIT is not set

(I think the built-in drivers for ixp4xx are smaller as well.)

Ben.

-- 
Ben Hutchings
A free society is one where it is safe to be unpopular. - Adlai Stevenson
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  parent reply	other threads:[~2014-02-21 19:51 UTC|newest]

Thread overview: 98+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-06 23:41 [PATCH 00/21] Move DT kirkwood into mach-mvebu Andrew Lunn
2014-02-06 23:41 ` [PATCH 01/21] ARM: Kirkwood: Give pm.c its own header file Andrew Lunn
2014-02-06 23:41 ` [PATCH 02/21] IRQ: Orion: Fix getting generic chip pointer Andrew Lunn
2014-02-07  2:38   ` Jason Cooper
2014-02-07 22:32   ` Sebastian Hesselbarth
2014-02-08 15:45     ` Jason Cooper
2014-02-06 23:41 ` [PATCH 03/21] ARM: Kirkwood: Convert mv88f6281gtw_ge switch setup to DT Andrew Lunn
2014-02-07  8:25   ` Thomas Petazzoni
2014-02-07  9:02     ` Andrew Lunn
2014-02-06 23:42 ` [PATCH 04/21] ARM: Kirkwood: Drop printing the SoC type and revision Andrew Lunn
2014-02-06 23:42 ` [PATCH 05/21] ARM: Kirkwood: Seperate board-dt from common and pcie code Andrew Lunn
2014-02-06 23:42 ` [PATCH 06/21] ARM: Kirkwood: ioremap the cpu_config register before using it Andrew Lunn
2014-02-06 23:42 ` [PATCH 07/21] ARM: Kirkwood: ioremap memory control register Andrew Lunn
2014-02-06 23:42 ` [PATCH 08/21] ARM: MVEBU: Add ARCH_MULTI_V7 to SoCs Andrew Lunn
2014-02-06 23:42 ` [PATCH 09/21] ARM: Orion: Move cache-feroceon-l2.h out of plat-orion Andrew Lunn
2014-02-06 23:42 ` [PATCH 10/21] ARM: MM: Add DT binding for Feroceon L2 cache Andrew Lunn
2014-02-07  0:51   ` Jason Gunthorpe
2014-02-07  1:27   ` Jason Cooper
2014-02-07  9:32     ` Andrew Lunn
2014-02-07 14:31       ` Jason Cooper
2014-02-07 18:13       ` Jason Gunthorpe
2014-02-07 14:48   ` Sudeep Holla
2014-02-07 18:21     ` Jason Gunthorpe
2014-02-07 19:12       ` Sudeep Holla
2014-02-06 23:42 ` [PATCH 11/21] ARM: Fix default CPU selection for ARCH_MULTI_V5 Andrew Lunn
2014-02-06 23:42 ` [PATCH 12/21] ARM: Fix MULTI_TLB for feroceon Andrew Lunn
2014-02-06 23:42 ` [PATCH 13/21] ARM: MM Enable building Feroceon L2 cache controller with ARCH_MVEBU Andrew Lunn
2014-02-06 23:42 ` [PATCH 14/21] ARM: Move kirkwood DT boards into mach-mvebu Andrew Lunn
2014-02-06 23:42 ` [PATCH 15/21] ARM: MVEBU: Let kirkwood use the system controller for restart Andrew Lunn
2014-02-07  1:37   ` Jason Cooper
2014-02-06 23:42 ` [PATCH 16/21] drivers: Enable building of Kirkwood drivers for mach-mvebu Andrew Lunn
2014-02-07  1:59   ` Jason Cooper
2014-02-07  9:13     ` Andrew Lunn
2014-02-07 14:35       ` Jason Cooper
2014-02-06 23:42 ` [PATCH 17/21] ARM: MVEBU: Enable mvebu-soc-id on Kirkwood Andrew Lunn
2014-02-06 23:42 ` [PATCH 18/21] ARM: config: Add a multi_v5_defconfig Andrew Lunn
2014-02-06 23:42 ` [PATCH 19/21] ARM: MVEBU: Simplifiy headers and make local Andrew Lunn
2014-02-07  8:31   ` Thomas Petazzoni
2014-02-07  9:20     ` Andrew Lunn
2014-02-07  9:36       ` Thomas Petazzoni
2014-02-07  9:45         ` Andrew Lunn
2014-02-07 18:27     ` Jason Gunthorpe
2014-02-06 23:42 ` [PATCH 20/21] ARM: MVEBU: Remove unneeded headers Andrew Lunn
2014-02-07  2:02   ` Jason Cooper
2014-02-06 23:42 ` [PATCH 21/21] ARM: Kirkwood: Remove DT support Andrew Lunn
2014-02-07  8:33   ` Thomas Petazzoni
2014-02-07  9:12     ` Andrew Lunn
2014-02-07 15:03     ` Jason Cooper
2014-02-07 15:09       ` Thomas Petazzoni
2014-02-07 15:15         ` Jason Cooper
2014-02-07 17:31           ` Sebastian Hesselbarth
2014-02-10 18:09         ` Andrew Lunn
2014-02-07 17:34   ` Sebastian Hesselbarth
2014-02-07 18:48     ` Jason Cooper
2014-02-20 10:30     ` Ian Campbell
2014-02-20 10:58       ` Andrew Lunn
2014-02-20 11:19         ` Russell King - ARM Linux
2014-02-20 11:28           ` Andrew Lunn
2014-02-20 11:39           ` Ian Campbell
2014-02-20 23:26             ` Jason Cooper
2014-02-24 16:00               ` Ian Campbell
2014-02-24 16:24                 ` Andrew Lunn
2014-02-24 16:26                   ` Ian Campbell
2014-02-24 16:34                     ` Jason Cooper
2014-05-03 13:19                   ` Automatically detecting when to use kirkwood-tsXXX-6281.dtb vs -6282.dtb (Was: Re: [PATCH 21/21] ARM: Kirkwood: Remove DT support) Ian Campbell
2014-05-03 14:40                     ` Andrew Lunn
2014-05-05  8:44                       ` Ian Campbell
2014-02-20 11:34         ` [PATCH 21/21] ARM: Kirkwood: Remove DT support Ian Campbell
2014-02-20 12:18           ` Andrew Lunn
2014-02-20 12:51             ` Ian Campbell
2014-02-20 13:23               ` Andrew Lunn
2014-02-20 14:24                 ` Ian Campbell
2014-02-21  2:00                   ` Ben Hutchings
2014-02-21 13:16                     ` Arnd Bergmann
2014-02-24 16:03                     ` Ian Campbell
2014-02-24 20:09                       ` Ben Hutchings
2014-02-20 13:53               ` Arnd Bergmann
2014-02-20 14:21                 ` Ian Campbell
2014-02-20 15:19                   ` Arnd Bergmann
2014-02-21  1:47                     ` Ben Hutchings
2014-02-21 13:07                       ` Arnd Bergmann
2014-02-21 15:58                         ` Jason Cooper
2014-02-21 19:51                         ` Ben Hutchings [this message]
2014-02-20 13:04             ` Arnd Bergmann
2014-02-20 14:22               ` Ian Campbell
2014-02-20 12:09         ` Arnd Bergmann
2014-02-20 23:24         ` Jason Cooper
2014-02-21 15:52           ` Thomas Petazzoni
2014-02-21 16:36             ` Arnd Bergmann
2014-02-21 16:41               ` Andrew Lunn
2014-02-21 16:42               ` Jason Cooper
2014-02-23 21:44               ` Simon Guinot
2014-02-25 12:44                 ` Arnd Bergmann
2014-02-25 13:05                   ` Simon Guinot
2014-02-25 15:36                     ` Arnd Bergmann
2014-02-25 15:09                       ` Simon Guinot
2014-02-25 15:59                         ` Arnd Bergmann
2014-02-07  1:14 ` [PATCH 00/21] Move DT kirkwood into mach-mvebu Jason Cooper

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