dm: spi: Change cs_info op to return -EINVAL for invalid cs num

[oweals/u-boot.git] / README

diff --git a/README b/README
index 2d91619a943f65b877b0caf51fd00f221b2d8f42..1389e8ff127f38f4a404bd4410bafa989f432158 100644 (file)
--- a/README
+++ b/README
@@ -267,6 +267,13 @@ board_init_f():
        - preloader_console_init() can be called here in extremis
        - should set up SDRAM, and anything needed to make the UART work
        - these is no need to clear BSS, it will be done by crt0.S
+       - for specific scenarios on certain architectures an early BSS *can*
+         be made available (via CONFIG_SPL_EARLY_BSS by moving the clearing
+         of BSS prior to entering board_init_f()) but doing so is discouraged.
+         Instead it is strongly recommended to architect any code changes
+         or additions such to not depend on the availability of BSS during
+         board_init_f() as indicated in other sections of this README to
+         maintain compatibility and consistency across the entire code base.
        - must return normally from this function (don't call board_init_r()
                directly)