u-boot.git/arch/arm/include/asm/global_data.h, branch v2023.01

Makefile: Allow LTO to be disabled for a build

2022-09-02T20:20:11Z

LTO (Link-Time Optimisation) is an very useful feature which can significantly reduce the size of U-Boot binaries. So far it has been made available for selected ARM boards and sandbox. However, incremental builds are much slower when LTO is used. For example, an incremental build of sandbox takes 2.1 seconds on my machine, but 6.7 seconds with LTO enabled. Add a NO_LTO parameter to the build, similar to NO_SDL, so it can be disabled during development if needed, for faster builds. Add some documentation about LTO while we are here. Signed-off-by: Simon Glass

imx: imx9: Get the chip revision through S400 API

2022-07-26T09:29:01Z

Update the get chip revision methond to use S400 API, also record other information like lifecycle and UID to global data. Signed-off-by: Peng Fan

misc: imx: S400_API: Move S400 MU and API to a common place

2022-07-26T09:29:00Z

Since iMX9 uses S401 which shares the API with iMX8ULP. So move S400 MU driver and API to a common place and selected by CONFIG_IMX_SENTINEL Signed-off-by: Ye Li Signed-off-by: Peng Fan

driver: misc: Add MU and S400 API to communicate with Sentinel

2021-08-09T12:46:50Z

Add MU driver and S400 API. Need enable MISC driver to work Signed-off-by: Ye Li

global_data: Ensure we have when symbols are not in Kconfig yet

2021-06-23T12:45:03Z

All symbols that are defined in Kconfig will always be defined (or not) prior to preprocessing due to the -include directive while building. However, symbols which are not yet migrated will only be defined (or not) once the board config.h is included, via . While the end goal must be to migrate all symbols, today we have cases where the size of gd will get mismatched within the build, based on include order. Mitigate this by making sure that any that uses symbols not in Kconfig does start with . Remove this when not needed. Cc: Alexey Brodkin Cc: Eugeniy Paltsev Cc: Huan Wang Cc: Angelo Dureghello Cc: Rick Chen Signed-off-by: Tom Rini

ARM: make gd a function call for LTO and set via set_gd()

2021-05-24T18:21:30Z

On ARM, the gd pointer is stored in registers r9 / x18. For this the -ffixed-r9 / -ffixed-x18 flag is used when compiling, but using global register variables causes errors when building with LTO, and these errors are very difficult to overcome. Richard Biener says [1]: Note that global register vars shouldn't be used with LTO and if they are restricted to just a few compilation units the recommended fix is to build those CUs without -flto. We cannot do this for U-Boot since all CUs use -ffixed-reg flag. It seems that with LTO we could in fact store the gd pointer differently and gain performance or size benefit by allowing the compiler to use r9 / x18. But this would need more work. So for now, when building with LTO, go the clang way, and instead of declaring gd a global register variable, we make it a function call via macro. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68384 Signed-off-by: Marek Behún Reviewed-by: Simon Glass

ARM: global_data: make set_gd() work for armv5 and armv6

2021-05-24T18:21:30Z

The Thumb instruction `ldr` is able to move high registers only from armv7. For armv5 and armv6 we have to use `mov`. Signed-off-by: Marek Behún Reviewed-by: Simon Glass

common: Add "ifndef ASSEMBLY" in asm/global_data.h

2021-02-24T21:51:49Z

Commit "common: Drop asm/global_data.h from common header" added asm/global_data.h into secure.h. However, secure.h will be included by psci.S. Adding asm/global_data.h has caused compilation failure in pcsi.S. Add "ifndef __ASSEMBLY__" in asm/global_data.h. Signed-off-by: Siew Chin Lim Reviewed-by: Simon Glass

common: Drop asm/global_data.h from common header

2021-02-02T20:33:42Z

Move this out of the common header and include it only where needed. In a number of cases this requires adding "struct udevice;" to avoid adding another large header or in other cases replacing / adding missing header files that had been pulled in, very indirectly. Finally, we have a few cases where we did not need to include at all, so remove that include. Signed-off-by: Simon Glass Signed-off-by: Tom Rini

arm: remove outdated comment concerning -ffixed-x18

2020-07-07T22:23:48Z

Clang 9 supports -ffixed-x18. Signed-off-by: Heinrich Schuchardt Reviewed-by: Simon Glass