[U-Boot] [PATCH 0/9] Remove use of gdata for global_data

[Ian Campbell]

On Tue, 2014-12-23 at 12:04 -0700, Simon Glass wrote:
> Some ARM boards use global_data in SPL before it set up by crt0.S. To
> achieve this they use a separate global_data variable called gdata which
> resides in the data section. The one set up by crt0.S is generally ignored.
> 
> This prevents crt0.S from setting up things like the early malloc() pool.
> It therefore prevents driver model from being used in SPL.
> 
> However gdata really isn't needed. In fact lowlevel_init() is called just
> before board_init_f() so, for SPL at least, there is no point in doing
> anything before board_init_f(). The one slightly messy area is that SPL
> may want to move the stack from SRAM to SDRAM at some point. But this should
> be done at the end of board_init_f() (or before board_init_r() is called)
> and is not a reason to init DRAM before board_init_f().
> 
> It isn't that difficult to get rid of gdata. This series builds on Tom Rini's
> recent series for omap3, and extends it to the other offenders: imx, sunxi
> and zynq.
> 
> I have tested so far only on sunxi.

Did you test both FEL and regular mode? (IOW, to what extent do I need
to refresh my memory on the differences between the two...)


>  This series is available at u-boot-dm
> branch 'gd-working'.
> 
> 
> Simon Glass (9):
>   arm: Add warnings about using gdata
>   sunxi: Move SPL s_init() code to board_init_f()
>   sunxi: Drop use of lowlevel_init()
>   arm: Reduce the scope of lowlevel_init()
>   zynq: Remove reference to gdata
>   imx: cm_fx6: Remove reference to gdata
>   imx: woodburn: Remove reference to gdata
>   imx: ls102xa: Remove reference to gdata
>   arm: Drop gdata global_data variable in SPL
> 
>  arch/arm/cpu/armv7/lowlevel_init.S      | 23 +++++++-----
>  arch/arm/cpu/armv7/sunxi/board.c        | 66 ++++++++++++++++-----------------
>  arch/arm/cpu/armv7/zynq/spl.c           |  3 --
>  arch/arm/include/asm/spl.h              |  2 -
>  arch/arm/lib/spl.c                      | 11 +++---
>  board/compulab/cm_fx6/spl.c             |  1 -
>  board/freescale/ls1021aqds/ls1021aqds.c |  3 --
>  board/freescale/ls1021atwr/ls1021atwr.c |  3 --
>  board/woodburn/woodburn.c               |  3 --
>  include/configs/sunxi-common.h          |  1 +
>  10 files changed, 53 insertions(+), 63 deletions(-)
>