upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/arch/arc/Kconfig

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menu "ARC architecture"
depends on ARC
config SYS_ARCH
default "arc"
config SYS_CPU
default "arcv1"
choice
prompt "CPU selection"
default CPU_ARC770D
config CPU_ARC750D
bool "ARC 750D"
select ARC_MMU_V2
help
Choose this option to build an U-Boot for ARC750D CPU.
config CPU_ARC770D
bool "ARC 770D"
select ARC_MMU_V3
help
Choose this option to build an U-Boot for ARC770D CPU.
endchoice
choice
prompt "MMU Version"
default ARC_MMU_V3 if CPU_ARC770D
default ARC_MMU_V2 if CPU_ARC750D
config ARC_MMU_V2
bool "MMU v2"
depends on CPU_ARC750D
help
Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
when 2 D-TLB and 1 I-TLB entries index into same 2way set.
config ARC_MMU_V3
bool "MMU v3"
depends on CPU_ARC770D
help
Introduced with ARC700 4.10: New Features
Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
Shared Address Spaces (SASID)
endchoice
choice
prompt "Target select"
config TARGET_TB100
bool "Support tb100"
config TARGET_ARCANGEL4
bool "Support arcangel4"
config TARGET_ARCANGEL4_BE
bool "Support arcangel4-be"
config TARGET_AXS101
bool "Support axs101"
endchoice
source "board/abilis/tb100/Kconfig"
source "board/synopsys/Kconfig"
source "board/synopsys/axs101/Kconfig"
endmenu