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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