Merge patch series "Tidy up use of 'SPL' and CONFIG_SPL_BUILD"WIP/11Oct2024

Simon Glass <sjg@chromium.org> says:

When the SPL build-phase was first created it was designed to solve a
particular problem (the need to init SDRAM so that U-Boot proper could
be loaded). It has since expanded to become an important part of U-Boot,
with three phases now present: TPL, VPL and SPL

Due to this history, the term 'SPL' is used to mean both a particular
phase (the one before U-Boot proper) and all the non-proper phases.
This has become confusing.

For a similar reason CONFIG_SPL_BUILD is set to 'y' for all 'SPL'
phases, not just SPL. So code which can only be compiled for actual SPL,
for example, must use something like this:

   #if defined(CONFIG_SPL_BUILD) && !defined(CONFIG_TPL_BUILD)

In Makefiles we have similar issues. SPL_ has been used as a variable
which expands to either SPL_ or nothing, to chose between options like
CONFIG_BLK and CONFIG_SPL_BLK. When TPL appeared, a new SPL_TPL variable
was created which expanded to 'SPL_', 'TPL_' or nothing. Later it was
updated to support 'VPL_' as well.

This series starts a change in terminology and usage to resolve the
above issues:

- The word 'xPL' is used instead of 'SPL' to mean a non-proper build
- A new CONFIG_XPL_BUILD define indicates that the current build is an
  'xPL' build
- The existing CONFIG_SPL_BUILD is changed to mean SPL; it is not now
  defined for TPL and VPL phases
- The existing SPL_ Makefile variable is renamed to SPL_
- The existing SPL_TPL Makefile variable is renamed to PHASE_

It should be noted that xpl_phase() can generally be used instead of
the above CONFIGs without a code-space or run-time penalty.

This series does not attempt to convert all of U-Boot to use this new
terminology but it makes a start. In particular, renaming spl.h and
common/spl seems like a bridge too far at this point.

The series is fully bisectable. It has also been checked to ensure there
are no code-size changes on any commit.

1 files changed, 8 insertions, 8 deletions

diff --git a/drivers/dfu/Makefile b/drivers/dfu/Makefile
index dfbf64da667..05d7cc61caa 100644
--- a/drivers/dfu/Makefile
+++ b/drivers/dfu/Makefile
@@ -3,11 +3,11 @@
 # Copyright (C) 2012 Samsung Electronics
 # Lukasz Majewski <l.majewski@samsung.com>
 
-obj-$(CONFIG_$(SPL_)DFU) += dfu.o
-obj-$(CONFIG_$(SPL_)DFU_MMC) += dfu_mmc.o
-obj-$(CONFIG_$(SPL_)DFU_MTD) += dfu_mtd.o
-obj-$(CONFIG_$(SPL_)DFU_NAND) += dfu_nand.o
-obj-$(CONFIG_$(SPL_)DFU_RAM) += dfu_ram.o
-obj-$(CONFIG_$(SPL_)DFU_SF) += dfu_sf.o
-obj-$(CONFIG_$(SPL_)DFU_WRITE_ALT) += dfu_alt.o
-obj-$(CONFIG_$(SPL_)DFU_VIRT) += dfu_virt.o
+obj-$(CONFIG_$(XPL_)DFU) += dfu.o
+obj-$(CONFIG_$(XPL_)DFU_MMC) += dfu_mmc.o
+obj-$(CONFIG_$(XPL_)DFU_MTD) += dfu_mtd.o
+obj-$(CONFIG_$(XPL_)DFU_NAND) += dfu_nand.o
+obj-$(CONFIG_$(XPL_)DFU_RAM) += dfu_ram.o
+obj-$(CONFIG_$(XPL_)DFU_SF) += dfu_sf.o
+obj-$(CONFIG_$(XPL_)DFU_WRITE_ALT) += dfu_alt.o
+obj-$(CONFIG_$(XPL_)DFU_VIRT) += dfu_virt.o