Following the RFC, here is the series implementing the mechanism in a cleaner way. The idea is that the SPL may take advantage of selecting its DTB from a pool of available DTBs. To do that several DTBs are embedded in a compressed FIT image appended at the end of the SPL. The patch is done in such way that this mechanism can easily be extended to other ways of loading the DTBs.
Here are some numbers: +----------------------------------------+ | Size |delta |boot-time| delta | | (bytes) |(bytes) |(ms) | (ms) | +---------------------------------------------------------------+ | reference | 120185 | | 1331 | | +---------------------------------------------------------------+ | feature | | | | | | deactiVated | 120185 | 0 | 1330 | -1 | +---------------------------------------------------------------+ | 1 DTB LZO | 120208 | 2 | 1331 | 0 | +---------------------------------------------------------------+ | 4 DTB LZO | 120810 | 625 | 1336 | 5 | +---------------------------------------------------------------+ | 4 DTB LZO | | | | | | no malloc | 120746 | 561 | 1343 | 12 | +---------------------------------------------------------------+ | 4 DTB GZIP | 128552 | 8367 | 1353 | 22 | +---------------------------------------------------------------+ | 4 DTB No comp | 132352 | 12167 | 1351 | 20 | +----------------------+----------+----------+---------+--------+
changes since v1: - improved help in Kconfig for the SPL_MULTI_DTB_FIT option - Added "reviewed-by" tags
changes since RFC: - split the RFC patch in several patches. - leverage work from Cooper Jr., Franklin (CONFIG_FIT_EMBED) as a big part of the code is similar. Rename CONFIG_FIT_EMBED as CONFIG_MULTI_DTB_FIT to prevent confusion with CONFIG_OF_EMBED. - use the default configuration if no match is provided by board_fit_config_name_match(). note that this is generic not just for this feature. - provide an option to not use dynamic memory allocation. - added a patch related to board detection on omap that's required to take advantage of this feature.
Jean-Jacques Hiblot (9): dts: renamed FIT_EMBED to MULTI_DTB_FIT and moved it to the dts Kconfig fit: use 'const' for the input of fdt_offset() and locate_dtb_in_fit() fit: fixed bug in locate_dtb_in_fit() fit: If no matching config is found in fit_find_config_node(), use the default one lzo: add a function to check the validity of the header gzip: add a function to parse the header lib: allow building lzo and gunzip for the SPL spl: dm: Make it possible for the SPL to pick its own DTB from a FIT omap: detect board before spl_early_init()
Makefile | 2 +- arch/arm/mach-omap2/hwinit-common.c | 4 +- board/ti/ks2_evm/board_k2e.c | 2 +- board/ti/ks2_evm/board_k2g.c | 2 +- board/ti/ks2_evm/board_k2hk.c | 2 +- board/ti/ks2_evm/board_k2l.c | 2 +- common/Kconfig | 16 ------ common/Makefile | 2 +- common/boot_fit.c | 6 +-- common/common_fit.c | 20 +++++++ configs/k2e_evm_defconfig | 2 +- configs/k2g_evm_defconfig | 2 +- configs/k2hk_evm_defconfig | 2 +- configs/k2l_evm_defconfig | 2 +- dts/Kconfig | 103 +++++++++++++++++++++++++++++++++++- include/boot_fit.h | 4 +- include/common.h | 1 + include/linux/lzo.h | 3 ++ lib/Kconfig | 11 ++++ lib/Makefile | 6 +-- lib/fdtdec.c | 85 +++++++++++++++++++++++++---- lib/gunzip.c | 15 ++++-- lib/lzo/lzo1x_decompress.c | 21 ++++++-- scripts/Makefile.spl | 35 +++++++++++- 24 files changed, 297 insertions(+), 53 deletions(-)