+ For platforms that use Intel FSP for the memory initialization,
+ please check FSP output HOB via U-Boot command 'fsp hob' to see
+ if there is FSP_NON_VOLATILE_STORAGE_HOB_GUID (asm/fsp/fsp_hob.h).
+ If such GUID does not exist, MRC cache is not avaiable on such
+ platform (eg: Intel Queensbay), which means selecting this option
+ here does not make any difference.
+
+config HAVE_MRC
+ bool "Add a System Agent binary"
+ depends on !HAVE_FSP
+ help
+ Select this option to add a System Agent binary to
+ the resulting U-Boot image. MRC stands for Memory Reference Code.
+ It is a binary blob which U-Boot uses to set up SDRAM.
+
+ Note: Without this binary U-Boot will not be able to set up its
+ SDRAM so will not boot.
+
+config CACHE_MRC_BIN
+ bool
+ depends on HAVE_MRC
+ default n
+ help
+ Enable caching for the memory reference code binary. This uses an
+ MTRR (memory type range register) to turn on caching for the section
+ of SPI flash that contains the memory reference code. This makes
+ SDRAM init run faster.
+
+config CACHE_MRC_SIZE_KB
+ int
+ depends on HAVE_MRC
+ default 512
+ help
+ Sets the size of the cached area for the memory reference code.
+ This ends at the end of SPI flash (address 0xffffffff) and is
+ measured in KB. Typically this is set to 512, providing for 0.5MB
+ of cached space.
+
+config DCACHE_RAM_BASE
+ hex
+ depends on HAVE_MRC
+ help
+ Sets the base of the data cache area in memory space. This is the
+ start address of the cache-as-RAM (CAR) area and the address varies
+ depending on the CPU. Once CAR is set up, read/write memory becomes
+ available at this address and can be used temporarily until SDRAM
+ is working.
+
+config DCACHE_RAM_SIZE
+ hex
+ depends on HAVE_MRC
+ default 0x40000
+ help
+ Sets the total size of the data cache area in memory space. This
+ sets the size of the cache-as-RAM (CAR) area. Note that much of the
+ CAR space is required by the MRC. The CAR space available to U-Boot
+ is normally at the start and typically extends to 1/4 or 1/2 of the
+ available size.
+
+config DCACHE_RAM_MRC_VAR_SIZE
+ hex
+ depends on HAVE_MRC
+ help
+ This is the amount of CAR (Cache as RAM) reserved for use by the
+ memory reference code. This depends on the implementation of the
+ memory reference code and must be set correctly or the board will
+ not boot.
+
+config HAVE_REFCODE
+ bool "Add a Reference Code binary"
+ help
+ Select this option to add a Reference Code binary to the resulting
+ U-Boot image. This is an Intel binary blob that handles system
+ initialisation, in this case the PCH and System Agent.
+
+ Note: Without this binary (on platforms that need it such as
+ broadwell) U-Boot will be missing some critical setup steps.
+ Various peripherals may fail to work.
+
projects / u-boot / blobdiff