[PATCH v2 02/32] README: Correct docs for CONFIG_SPL_BUILD

[Simon Glass]

This option is defined in both SPL and TPL builds, so correct the docs
related to this. Also point to spl_phase() which is normally a better
option. Mention VPL as well.

Signed-off-by: Simon Glass <sjg at chromium.org>
Reported-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---

(no changes since v1)

 README | 26 ++++++++++++++++++--------
 1 file changed, 18 insertions(+), 8 deletions(-)

diff --git a/README b/README
index 60c6b8a19db1..f26c34a5e200 100644
--- a/README
+++ b/README
@@ -1545,16 +1545,26 @@ Low Level (hardware related) configuration options:
 		globally (CONFIG_CMD_MEMORY).
 
 - CONFIG_SPL_BUILD
-		Set when the currently-running compilation is for an artifact
-		that will end up in the SPL (as opposed to the TPL or U-Boot
-		proper). Code that needs stage-specific behavior should check
-		this.
+		Set when the currently running compilation is for an artifact
+		that will end up in one of the 'xPL' builds, i.e. SPL, TPL or
+		VPL. Code that needs phase-specific behaviour can check this,
+		or (where possible) use spl_phase() instead.
+
+		Note that CONFIG_SPL_BUILD *is* always defined when either
+		of CONFIG_TPL_BUILD / CONFIG_VPL_BUILD is defined. This can be
+		counter-intuitive and should perhaps be changed.
 
 - CONFIG_TPL_BUILD
-		Set when the currently-running compilation is for an artifact
-		that will end up in the TPL (as opposed to the SPL or U-Boot
-		proper). Code that needs stage-specific behavior should check
-		this.
+		Set when the currently running compilation is for an artifact
+		that will end up in the TPL build (as opposed to SPL, VPL or
+		U-Boot proper). Code that needs phase-specific behaviour can
+		check this, or (where possible) use spl_phase() instead.
+
+- CONFIG_VPL_BUILD
+		Set when the currently running compilation is for an artifact
+		that will end up in the VPL build (as opposed to the SPL, TPL
+		or U-Boot proper). Code that needs phase-specific behaviour can
+		check this, or (where possible) use spl_phase() instead.
 
 - CONFIG_ARCH_MAP_SYSMEM
 		Generally U-Boot (and in particular the md command) uses
-- 
2.43.0.rc0.421.g78406f8d94-goog