diff options
| author | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2024-11-11 10:16:21 +0100 |
|---|---|---|
| committer | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2024-11-23 23:16:03 +0100 |
| commit | f9dd2e2c9f703d5500bd3b00b840430a9aea4c45 (patch) | |
| tree | e420796ee6de11145ca03816c9b16679dd1ccfac | |
| parent | 8c871871194d230af018d818824086c82faa5b4a (diff) | |
doc: remove README.TPL
doc/develop/spl.rst describes SPL, TPL, VPL.
Remove the outdated README.TPL document.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
| -rw-r--r-- | doc/README.TPL | 49 |
1 files changed, 0 insertions, 49 deletions
diff --git a/doc/README.TPL b/doc/README.TPL deleted file mode 100644 index 95b466e4af9..00000000000 --- a/doc/README.TPL +++ /dev/null @@ -1,49 +0,0 @@ -Generic TPL framework -===================== - -Overview --------- - -TPL---Third Program Loader. - -Due to the SPL on some boards(powerpc mpc85xx) has a size limit and cannot -be compatible with all the external device(e.g. DDR). So add a tertiary -program loader (TPL) to enable a loader stub loaded by the code from the -SPL. It loads the final uboot image into DDR, then jump to it to begin -execution. Now, only the powerpc mpc85xx has this requirement and will -implemente it. - -Keep consistent with SPL, with this framework almost all source files for a -board can be reused. No code duplication or symlinking is necessary anymore. - -How it works ------------- - -There has been a directory $(srctree)/spl which contains only a Makefile. The -Makefile is shared by SPL and TPL. - -The object files are built separately for SPL/TPL and placed in the -directory spl/tpl. The final binaries which are generated are -u-boot-{spl|tpl}, u-boot-{spl|tpl}.bin and u-boot-{spl|tpl}.map. - -During the TPL build a variable named CONFIG_TPL_BUILD is exported in the -make environment and also appended to CPPFLAGS with -DCONFIG_TPL_BUILD. - -The SPL options are shared by SPL and TPL, the board config file should -determine which SPL options to choose based on whether CONFIG_TPL_BUILD -is set. Source files can be compiled for TPL with options chosen in the -board config file. - -TPL use a small device tree (u-boot-tpl.dtb), containing only the nodes with -the pre-relocation properties: 'bootph-all' and 'bootph-pre-sram' -(see doc/develop/spl.rst for details). - -For example: - -spl/Makefile: -LIBS-$(CONFIG_SPL_LIBCOMMON_SUPPORT) += common/libcommon.o - -CONFIG_SPL_LIBCOMMON_SUPPORT is defined in board config file: -#ifdef CONFIG_TPL_BUILD -#define CONFIG_SPL_LIBCOMMON_SUPPORT -#endif |