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https://github.com/brain-hackers/u-boot-brain
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65dd74a674
Implement SDRAM init using the Memory Reference Code (mrc.bin) provided in the board directory and the SDRAM SPD information in the device tree. This also needs the Intel Management Engine (me.bin) to work. Binary blobs everywhere: so far we have MRC, ME and microcode. SDRAM init works by setting up various parameters and calling the MRC. This in turn does some sort of magic to work out how much memory there is and the timing parameters to use. It also sets up the DRAM controllers. When the MRC returns, we use the information it provides to map out the available memory in U-Boot. U-Boot normally moves itself to the top of RAM. On x86 the RAM is not generally contiguous, and anyway some RAM may be above 4GB which doesn't work in 32-bit mode. So we relocate to the top of the largest block of RAM we can find below 4GB. Memory above 4GB is accessible with special functions (see physmem). It would be possible to build U-Boot in 64-bit mode but this wouldn't necessarily provide any more memory, since the largest block is often below 4GB. Anyway U-Boot doesn't need huge amounts of memory - even a very large ramdisk seldom exceeds 100-200MB. U-Boot has support for booting 64-bit kernels directly so this does not pose a limitation in that area. Also there are probably parts of U-Boot that will not work correctly in 64-bit mode. The MRC is one. There is some work remaining in this area. Since memory init is very slow (over 500ms) it is possible to save the parameters in SPI flash to speed it up next time. Suspend/resume support is not fully implemented, or at least it is not efficient. With this patch, link boots to a prompt. Signed-off-by: Simon Glass <sjg@chromium.org>
173 lines
3.4 KiB
Plaintext
173 lines
3.4 KiB
Plaintext
#
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# From Coreboot src/northbridge/intel/sandybridge/Kconfig
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#
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# Copyright (C) 2010 Google Inc.
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#
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# SPDX-License-Identifier: GPL-2.0
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config NORTHBRIDGE_INTEL_SANDYBRIDGE
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bool
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select CACHE_MRC_BIN
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select CPU_INTEL_MODEL_206AX
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config NORTHBRIDGE_INTEL_IVYBRIDGE
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bool
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select CACHE_MRC_BIN
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select CPU_INTEL_MODEL_306AX
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if NORTHBRIDGE_INTEL_SANDYBRIDGE
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config VGA_BIOS_ID
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string
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default "8086,0106"
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config CACHE_MRC_SIZE_KB
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int
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default 256
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config MRC_CACHE_BASE
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hex
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default 0xff800000
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config MRC_CACHE_LOCATION
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hex
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depends on !CHROMEOS
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default 0x1ec000
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config MRC_CACHE_SIZE
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hex
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depends on !CHROMEOS
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default 0x10000
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config DCACHE_RAM_BASE
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hex
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default 0xff7f0000
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config DCACHE_RAM_SIZE
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hex
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default 0x10000
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endif
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if NORTHBRIDGE_INTEL_IVYBRIDGE
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config VGA_BIOS_ID
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string
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default "8086,0166"
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config EXTERNAL_MRC_BLOB
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bool
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default n
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config CACHE_MRC_SIZE_KB
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int
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default 512
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config MRC_CACHE_BASE
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hex
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default 0xff800000
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config MRC_CACHE_LOCATION
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hex
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depends on !CHROMEOS
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default 0x370000
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config MRC_CACHE_SIZE
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hex
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depends on !CHROMEOS
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default 0x10000
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config DCACHE_RAM_BASE
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hex
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default 0xff7e0000
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config DCACHE_RAM_SIZE
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hex
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default 0x20000
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endif
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if NORTHBRIDGE_INTEL_SANDYBRIDGE || NORTHBRIDGE_INTEL_IVYBRIDGE
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config HAVE_MRC
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bool "Add a System Agent binary"
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help
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Select this option to add a System Agent binary to
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the resulting U-Boot image. MRC stands for Memory Reference Code.
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It is a binary blob which U-Boot uses to set up SDRAM.
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Note: Without this binary U-Boot will not be able to set up its
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SDRAM so will not boot.
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config DCACHE_RAM_MRC_VAR_SIZE
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hex
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default 0x4000
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help
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This is the amount of CAR (Cache as RAM) reserved for use by the
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memory reference code. This should be set to 16KB (0x4000 hex)
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so that MRC has enough space to run.
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config MRC_FILE
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string "Intel System Agent path and filename"
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depends on HAVE_MRC
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default "systemagent-ivybridge.bin" if NORTHBRIDGE_INTEL_IVYBRIDGE
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default "systemagent-sandybridge.bin" if NORTHBRIDGE_INTEL_SANDYBRIDGE
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help
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The path and filename of the file to use as System Agent
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binary.
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config CPU_SPECIFIC_OPTIONS
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def_bool y
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select SMM_TSEG
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select ARCH_BOOTBLOCK_X86_32
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select ARCH_ROMSTAGE_X86_32
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select ARCH_RAMSTAGE_X86_32
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select SMP
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select SSE2
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select UDELAY_LAPIC
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select CPU_MICROCODE_IN_CBFS
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select TSC_SYNC_MFENCE
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select HAVE_INTEL_ME
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select X86_RAMTEST
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config SMM_TSEG_SIZE
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hex
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default 0x800000
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config ENABLE_VMX
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bool "Enable VMX for virtualization"
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default n
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help
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Virtual Machine Extensions are provided in many x86 CPUs. These
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provide various facilities for allowing a host OS to provide an
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environment where potentially several guest OSes have only
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limited access to the underlying hardware. This is achieved
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without resorting to software trapping and/or instruction set
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emulation (which would be very slow).
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Intel's implementation of this is called VT-x. This option enables
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VT-x this so that the OS that is booted by U-Boot can make use of
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these facilities. If this option is not enabled, then the host OS
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will be unable to support virtualisation, or it will run very
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slowly.
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endif
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config CPU_INTEL_SOCKET_RPGA989
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bool
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if CPU_INTEL_SOCKET_RPGA989
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config SOCKET_SPECIFIC_OPTIONS # dummy
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def_bool y
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select MMX
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select SSE
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select CACHE_AS_RAM
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config CACHE_MRC_BIN
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bool
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default n
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endif
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