malloc: add SPDX license identifiers

[u-boot.git] / Kconfig

diff --git a/Kconfig b/Kconfig
index 6dc20ed25b2985aae2a963e218f1353574919070..f8c1a77bedb65e02944987ed79931a35373a5eca 100644 (file)
--- a/Kconfig
+++ b/Kconfig
@@ -85,6 +85,30 @@ config SPL_OPTIMIZE_INLINING
          do what it thinks is best, which is desirable in some cases for size
          reasons.
 
+config ARCH_SUPPORTS_LTO
+       bool
+
+config LTO
+       bool "Enable Link Time Optimizations"
+       depends on ARCH_SUPPORTS_LTO
+       default n
+       help
+         This option enables Link Time Optimization (LTO), a mechanism which
+         allows the compiler to optimize between different compilation units.
+
+         This can optimize away dead code paths, resulting in smaller binary
+         size (if CC_OPTIMIZE_FOR_SIZE is enabled).
+
+         This option is not available for every architecture and may
+         introduce bugs.
+
+         Currently, when compiling with GCC, due to a weird bug regarding
+         jobserver, the final linking will not respect make's --jobs argument.
+         Instead all available processors will be used (as reported by the
+         nproc command).
+
+         If unsure, say n.
+
 config TPL_OPTIMIZE_INLINING
        bool "Allow compiler to uninline functions marked 'inline' in TPL"
        depends on TPL
@@ -217,22 +241,25 @@ config SYS_MALLOC_LEN
          TODO: Use for other architectures
 
 config SPL_SYS_MALLOC_F_LEN
-       hex "Size of malloc() pool in SPL before relocation"
+       hex "Size of malloc() pool in SPL"
        depends on SYS_MALLOC_F && SPL
        default 0x2800 if RCAR_GEN3
        default SYS_MALLOC_F_LEN
        help
-         Before relocation, memory is very limited on many platforms. Still,
+         In SPL memory is very limited on many platforms. Still,
          we can provide a small malloc() pool if needed. Driver model in
          particular needs this to operate, so that it can allocate the
          initial serial device and any others that are needed.
 
+         It is possible to enable CONFIG_SYS_SPL_MALLOC_START to start a new
+         malloc() region in SDRAM once it is inited.
+
 config TPL_SYS_MALLOC_F_LEN
-       hex "Size of malloc() pool in TPL before relocation"
+       hex "Size of malloc() pool in TPL"
        depends on SYS_MALLOC_F && TPL
-       default SYS_MALLOC_F_LEN
+       default SPL_SYS_MALLOC_F_LEN
        help
-         Before relocation, memory is very limited on many platforms. Still,
+         In TPL memory is very limited on many platforms. Still,
          we can provide a small malloc() pool if needed. Driver model in
          particular needs this to operate, so that it can allocate the
          initial serial device and any others that are needed.