[U-Boot] [PATCH] spl: fat/fs: Add option to include/exclude FAT write build in SPL

[Chee, Tien Fong <tien.fong.chee@intel.com>]

On Thu, 2019-01-17 at 07:25 -0500, Tom Rini wrote:
> On Thu, Jan 17, 2019 at 08:54:48AM +0100, Simon Goldschmidt wrote:
> > 
> > On Thu, Jan 17, 2019 at 8:10 AM <tien.fong.chee@intel.com> wrote:
> > > 
> > > 
> > > From: Tien Fong Chee <tien.fong.chee@intel.com>
> > > 
> > > Most of the time SPL only needs very simple FAT reading, so
> > > having
> > > CONFIG_SPL_FAT_WRITE to exclude or undefined would help to save
> > > 64KiB
> > > default max clustersize from memory.
> > > 
> > > Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
> > > ---
> > >  common/spl/Kconfig |    7 +++++++
> > >  fs/fat/Makefile    |    7 ++++++-
> > >  fs/fat/fat.c       |    4 +++-
> > >  fs/fs.c            |    3 ++-
> > >  4 files changed, 18 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/common/spl/Kconfig b/common/spl/Kconfig
> > > index 0ddbffc..dad4c11 100644
> > > --- a/common/spl/Kconfig
> > > +++ b/common/spl/Kconfig
> > > @@ -403,6 +403,13 @@ config SPL_FAT_SUPPORT
> > >           filesystem from within SPL. Support for the underlying
> > > block
> > >           device (e.g. MMC or USB) must be enabled separately.
> > > 
> > > +config SPL_FAT_WRITE
> > > +       bool "Support write for FAT filesystems"
> > > +       help
> > > +         Enable write support for FAT and VFAT filesystems with
> > > SPL.
> > > +         Support for the underlying block device (e.g. MMC or
> > > USB) must be
> > > +         enabled separately.
> > > +
> > >  config SPL_FPGA_SUPPORT
> > >         bool "Support FPGAs"
> > >         help
> > > diff --git a/fs/fat/Makefile b/fs/fat/Makefile
> > > index e64b61a..654b8c3 100644
> > > --- a/fs/fat/Makefile
> > > +++ b/fs/fat/Makefile
> > > @@ -1,5 +1,10 @@
> > >  # SPDX-License-Identifier: GPL-2.0+
> > >  #
> > > 
> > > +ifdef CONFIG_SPL_BUILD
> > >  obj-$(CONFIG_FS_FAT)   := fat.o
> > > -obj-$(CONFIG_FAT_WRITE):= fat_write.o
> > > +obj-$(CONFIG_SPL_FAT_WRITE) = fat_write.o
> > > +else
> > > +obj-$(CONFIG_FS_FAT)   := fat.o
> > > +obj-$(CONFIG_FAT_WRITE) = fat_write.o
> Like the ext4 one, we need a patch to rename SPL_FAT_SUPPORT to
> SPL_FS_FAT and then:
> 
> obj-$(CONFIG_$(SPL_)FS_FAT) += fat.o
> obj-$(CONFIG_$(SPL_)FAT_WRITE) += fat_write.o
Okay.
> 
> > 
> > > 
> > > +endif
> > > diff --git a/fs/fat/fat.c b/fs/fat/fat.c
> > > index ac8913e..8803fb4 100644
> > > --- a/fs/fat/fat.c
> > > +++ b/fs/fat/fat.c
> > > @@ -145,7 +145,9 @@ static void get_name(dir_entry *dirent, char
> > > *s_name)
> > >  }
> > > 
> > >  static int flush_dirty_fat_buffer(fsdata *mydata);
> > > -#if !defined(CONFIG_FAT_WRITE)
> > > +
> > > +#if (!defined(CONFIG_SPL_BUILD) && !defined(CONFIG_FAT_WRITE))
> > > || \
> > > +       (defined(CONFIG_SPL_BUILD) &&
> > > !defined(CONFIG_SPL_FAT_WRITE))
> > What about 'CONFIG_IS_ENABLED(FAT_WRITE)' ?
> Yes, CONFIG_IS_ENABLED(FAT_WRITE) please.
Okay.
>