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| author | Timur Tabi <timur@freescale.com> | 2011-08-04 18:03:41 -0500 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2011-09-29 19:01:04 -0500 |
| commit | e46fedfeb214d118b9983d11fcc929ed49f5ccd7 (patch) | |
| tree | 082992bbcb09217952f6f758ef78d74460cc2458 /README | |
| parent | b6c3722dfa98a68236301ddf525dfaf90a95224f (diff) | |
| download | u-boot-imx-e46fedfeb214d118b9983d11fcc929ed49f5ccd7.zip u-boot-imx-e46fedfeb214d118b9983d11fcc929ed49f5ccd7.tar.gz u-boot-imx-e46fedfeb214d118b9983d11fcc929ed49f5ccd7.tar.bz2 | |
powerpc/85xx: introduce and document CONFIG_SYS_CCSRBAR macros
Introduce the CONFIG_SYS_CCSRBAR_PHYS_HIGH and CONFIG_SYS_CCSRBAR_PHYS_LOW
macros, which contain the high and low portions of CONFIG_SYS_CCSRBAR_PHYS.
This is necessary for the assembly-language code that relocates CCSR, since
the assembler does not understand 64-bit constants.
CONFIG_SYS_CCSRBAR_PHYS is automatically defined from the
CONFIG_SYS_CCSRBAR_PHYS_HIGH and CONFIG_SYS_CCSRBAR_PHYS_LOW macros, so it
should not be defined in a board header file. Similarly,
CONFIG_SYS_CCSRBAR_DEFAULT is defined for each SOC in config_mpc85xx.h, so
it should also not be defined in the board header file.
CONFIG_SYS_CCSR_DO_NOT_RELOCATE is a "short-cut" macro that guarantees that
CONFIG_SYS_CCSRBAR_PHYS is set to the same value as CONFIG_SYS_CCSRBAR_DEFAULT,
and so CCSR will not be relocated.
Since CONFIG_SYS_CCSRBAR_DEFAULT is locked to a fixed value, multi-stage U-Boot
builds (e.g. NAND) are required to relocate CCSR only during the last stage
(i.e. the "real" U-Boot). All other stages should define
CONFIG_SYS_CCSR_DO_NOT_RELOCATE to ensure that CCSR is not relocated.
README is updated with descriptions of all the CONFIG_SYS_CCSRBAR_xxx macros.
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 37 |
1 files changed, 37 insertions, 0 deletions
@@ -2862,6 +2862,43 @@ Low Level (hardware related) configuration options: and RPXsuper) to be able to adjust the position of the IMMR register after a reset. +- CONFIG_SYS_CCSRBAR_DEFAULT: + Default (power-on reset) physical address of CCSR on Freescale + PowerPC SOCs. + +- CONFIG_SYS_CCSRBAR: + Virtual address of CCSR. On a 32-bit build, this is typically + the same value as CONFIG_SYS_CCSRBAR_DEFAULT. + + CONFIG_SYS_DEFAULT_IMMR must also be set to this value, + for cross-platform code that uses that macro instead. + +- CONFIG_SYS_CCSRBAR_PHYS: + Physical address of CCSR. CCSR can be relocated to a new + physical address, if desired. In this case, this macro should + be set to that address. Otherwise, it should be set to the + same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR + is typically relocated on 36-bit builds. It is recommended + that this macro be defined via the _HIGH and _LOW macros: + + #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH + * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW) + +- CONFIG_SYS_CCSRBAR_PHYS_HIGH: + Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically + either 0 (32-bit build) or 0xF (36-bit build). This macro is + used in assembly code, so it must not contain typecasts or + integer size suffixes (e.g. "ULL"). + +- CONFIG_SYS_CCSRBAR_PHYS_LOW: + Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is + used in assembly code, so it must not contain typecasts or + integer size suffixes (e.g. "ULL"). + +- CONFIG_SYS_CCSR_DO_NOT_RELOCATE: + If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be + forced to a value that ensures that CCSR is not relocated. + - Floppy Disk Support: CONFIG_SYS_FDC_DRIVE_NUMBER |