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Kconfig
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Kconfig
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config MMU
def_bool n
config FPU
def_bool n
config RWSEM_GENERIC_SPINLOCK
def_bool y
config RWSEM_XCHGADD_ALGORITHM
def_bool n
config BLACKFIN
def_bool y
select HAVE_ARCH_KGDB
select HAVE_ARCH_TRACEHOOK
select HAVE_DYNAMIC_FTRACE
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_TRACE_MCOUNT_TEST
select HAVE_IDE
select HAVE_KERNEL_GZIP if RAMKERNEL
select HAVE_KERNEL_BZIP2 if RAMKERNEL
select HAVE_KERNEL_LZMA if RAMKERNEL
select HAVE_KERNEL_LZO if RAMKERNEL
select HAVE_OPROFILE
select HAVE_PERF_EVENTS
select ARCH_HAVE_CUSTOM_GPIO_H
select ARCH_REQUIRE_GPIOLIB
select HAVE_UID16
select HAVE_UNDERSCORE_SYMBOL_PREFIX
select VIRT_TO_BUS
select ARCH_WANT_IPC_PARSE_VERSION
select GENERIC_ATOMIC64
select GENERIC_IRQ_PROBE
select HAVE_NMI_WATCHDOG if NMI_WATCHDOG
select GENERIC_SMP_IDLE_THREAD
select ARCH_USES_GETTIMEOFFSET if !GENERIC_CLOCKEVENTS
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select HAVE_DEBUG_STACKOVERFLOW
config GENERIC_CSUM
def_bool y
config GENERIC_BUG
def_bool y
depends on BUG
config ZONE_DMA
def_bool y
config GENERIC_GPIO
def_bool y
config FORCE_MAX_ZONEORDER
int
default "14"
config GENERIC_CALIBRATE_DELAY
def_bool y
config LOCKDEP_SUPPORT
def_bool y
config STACKTRACE_SUPPORT
def_bool y
config TRACE_IRQFLAGS_SUPPORT
def_bool y
source "init/Kconfig"
source "kernel/Kconfig.preempt"
source "kernel/Kconfig.freezer"
menu "Blackfin Processor Options"
comment "Processor and Board Settings"
choice
prompt "CPU"
default BF533
config BF512
bool "BF512"
help
BF512 Processor Support.
config BF514
bool "BF514"
help
BF514 Processor Support.
config BF516
bool "BF516"
help
BF516 Processor Support.
config BF518
bool "BF518"
help
BF518 Processor Support.
config BF522
bool "BF522"
help
BF522 Processor Support.
config BF523
bool "BF523"
help
BF523 Processor Support.
config BF524
bool "BF524"
help
BF524 Processor Support.
config BF525
bool "BF525"
help
BF525 Processor Support.
config BF526
bool "BF526"
help
BF526 Processor Support.
config BF527
bool "BF527"
help
BF527 Processor Support.
config BF531
bool "BF531"
help
BF531 Processor Support.
config BF532
bool "BF532"
help
BF532 Processor Support.
config BF533
bool "BF533"
help
BF533 Processor Support.
config BF534
bool "BF534"
help
BF534 Processor Support.
config BF536
bool "BF536"
help
BF536 Processor Support.
config BF537
bool "BF537"
help
BF537 Processor Support.
config BF538
bool "BF538"
help
BF538 Processor Support.
config BF539
bool "BF539"
help
BF539 Processor Support.
config BF542_std
bool "BF542"
help
BF542 Processor Support.
config BF542M
bool "BF542m"
help
BF542 Processor Support.
config BF544_std
bool "BF544"
help
BF544 Processor Support.
config BF544M
bool "BF544m"
help
BF544 Processor Support.
config BF547_std
bool "BF547"
help
BF547 Processor Support.
config BF547M
bool "BF547m"
help
BF547 Processor Support.
config BF548_std
bool "BF548"
help
BF548 Processor Support.
config BF548M
bool "BF548m"
help
BF548 Processor Support.
config BF549_std
bool "BF549"
help
BF549 Processor Support.
config BF549M
bool "BF549m"
help
BF549 Processor Support.
config BF561
bool "BF561"
help
BF561 Processor Support.
config BF609
bool "BF609"
select CLKDEV_LOOKUP
help
BF609 Processor Support.
endchoice
config SMP
depends on BF561
select TICKSOURCE_CORETMR
bool "Symmetric multi-processing support"
---help---
This enables support for systems with more than one CPU,
like the dual core BF561. If you have a system with only one
CPU, say N. If you have a system with more than one CPU, say Y.
If you don't know what to do here, say N.
config NR_CPUS
int
depends on SMP
default 2 if BF561
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
depends on SMP
default y
config BF_REV_MIN
int
default 0 if (BF51x || BF52x || (BF54x && !BF54xM)) || BF60x
default 2 if (BF537 || BF536 || BF534)
default 3 if (BF561 || BF533 || BF532 || BF531 || BF54xM)
default 4 if (BF538 || BF539)
config BF_REV_MAX
int
default 2 if (BF51x || BF52x || (BF54x && !BF54xM)) || BF60x
default 3 if (BF537 || BF536 || BF534 || BF54xM)
default 5 if (BF561 || BF538 || BF539)
default 6 if (BF533 || BF532 || BF531)
choice
prompt "Silicon Rev"
default BF_REV_0_0 if (BF51x || BF52x || BF60x)
default BF_REV_0_2 if (BF534 || BF536 || BF537 || (BF54x && !BF54xM))
default BF_REV_0_3 if (BF531 || BF532 || BF533 || BF54xM || BF561)
config BF_REV_0_0
bool "0.0"
depends on (BF51x || BF52x || (BF54x && !BF54xM) || BF60x)
config BF_REV_0_1
bool "0.1"
depends on (BF51x || BF52x || (BF54x && !BF54xM) || BF60x)
config BF_REV_0_2
bool "0.2"
depends on (BF51x || BF52x || BF537 || BF536 || BF534 || (BF54x && !BF54xM))
config BF_REV_0_3
bool "0.3"
depends on (BF54xM || BF561 || BF537 || BF536 || BF534 || BF533 || BF532 || BF531)
config BF_REV_0_4
bool "0.4"
depends on (BF561 || BF533 || BF532 || BF531 || BF538 || BF539 || BF54x)
config BF_REV_0_5
bool "0.5"
depends on (BF561 || BF533 || BF532 || BF531 || BF538 || BF539)
config BF_REV_0_6
bool "0.6"
depends on (BF533 || BF532 || BF531)
config BF_REV_ANY
bool "any"
config BF_REV_NONE
bool "none"
endchoice
config BF53x
bool
depends on (BF531 || BF532 || BF533 || BF534 || BF536 || BF537)
default y
config GPIO_ADI
def_bool y
depends on (BF51x || BF52x || BF53x || BF538 || BF539 || BF561)
config PINCTRL
def_bool y
depends on BF54x || BF60x
config MEM_MT48LC64M4A2FB_7E
bool
depends on (BFIN533_STAMP)
default y
config MEM_MT48LC16M16A2TG_75
bool
depends on (BFIN533_EZKIT || BFIN561_EZKIT \
|| BFIN533_BLUETECHNIX_CM || BFIN537_BLUETECHNIX_CM_E \
|| BFIN537_BLUETECHNIX_CM_U || H8606_HVSISTEMAS \
|| BFIN527_BLUETECHNIX_CM)
default y
config MEM_MT48LC32M8A2_75
bool
depends on (BFIN518F_EZBRD || BFIN537_STAMP || PNAV10 || BFIN538_EZKIT)
default y
config MEM_MT48LC8M32B2B5_7
bool
depends on (BFIN561_BLUETECHNIX_CM)
default y
config MEM_MT48LC32M16A2TG_75
bool
depends on (BFIN527_EZKIT || BFIN527_EZKIT_V2 || BFIN532_IP0X || BLACKSTAMP || BFIN527_AD7160EVAL)
default y
config MEM_MT48H32M16LFCJ_75
bool
depends on (BFIN526_EZBRD)
default y
config MEM_MT47H64M16
bool
depends on (BFIN609_EZKIT)
default y
source "arch/blackfin/mach-bf518/Kconfig"
source "arch/blackfin/mach-bf527/Kconfig"
source "arch/blackfin/mach-bf533/Kconfig"
source "arch/blackfin/mach-bf561/Kconfig"
source "arch/blackfin/mach-bf537/Kconfig"
source "arch/blackfin/mach-bf538/Kconfig"
source "arch/blackfin/mach-bf548/Kconfig"
source "arch/blackfin/mach-bf609/Kconfig"
menu "Board customizations"
config CMDLINE_BOOL
bool "Default bootloader kernel arguments"
config CMDLINE
string "Initial kernel command string"
depends on CMDLINE_BOOL
default "console=ttyBF0,57600"
help
If you don't have a boot loader capable of passing a command line string
to the kernel, you may specify one here. As a minimum, you should specify
the memory size and the root device (e.g., mem=8M, root=/dev/nfs).
config BOOT_LOAD
hex "Kernel load address for booting"
default "0x1000"
range 0x1000 0x20000000
help
This option allows you to set the load address of the kernel.
This can be useful if you are on a board which has a small amount
of memory or you wish to reserve some memory at the beginning of
the address space.
Note that you need to keep this value above 4k (0x1000) as this
memory region is used to capture NULL pointer references as well
as some core kernel functions.
config PHY_RAM_BASE_ADDRESS
hex "Physical RAM Base"
default 0x0
help
set BF609 FPGA physical SRAM base address
config ROM_BASE
hex "Kernel ROM Base"
depends on ROMKERNEL
default "0x20040040"
range 0x20000000 0x20400000 if !(BF54x || BF561 || BF60x)
range 0x20000000 0x30000000 if (BF54x || BF561)
range 0xB0000000 0xC0000000 if (BF60x)
help
Make sure your ROM base does not include any file-header
information that is prepended to the kernel.
For example, the bootable U-Boot format (created with
mkimage) has a 64 byte header (0x40). So while the image
you write to flash might start at say 0x20080000, you have
to add 0x40 to get the kernel's ROM base as it will come
after the header.
comment "Clock/PLL Setup"
config CLKIN_HZ
int "Frequency of the crystal on the board in Hz"
default "10000000" if BFIN532_IP0X
default "11059200" if BFIN533_STAMP
default "24576000" if PNAV10
default "25000000" # most people use this
default "27000000" if BFIN533_EZKIT
default "30000000" if BFIN561_EZKIT
default "24000000" if BFIN527_AD7160EVAL
help
The frequency of CLKIN crystal oscillator on the board in Hz.
Warning: This value should match the crystal on the board. Otherwise,
peripherals won't work properly.
config BFIN_KERNEL_CLOCK
bool "Re-program Clocks while Kernel boots?"
default n
help
This option decides if kernel clocks are re-programed from the
bootloader settings. If the clocks are not set, the SDRAM settings
are also not changed, and the Bootloader does 100% of the hardware
configuration.
config PLL_BYPASS
bool "Bypass PLL"
depends on BFIN_KERNEL_CLOCK && (!BF60x)
default n
config CLKIN_HALF
bool "Half Clock In"
depends on BFIN_KERNEL_CLOCK && (! PLL_BYPASS)
default n
help
If this is set the clock will be divided by 2, before it goes to the PLL.
config VCO_MULT
int "VCO Multiplier"
depends on BFIN_KERNEL_CLOCK && (! PLL_BYPASS)
range 1 64
default "22" if BFIN533_EZKIT
default "45" if BFIN533_STAMP
default "20" if (BFIN537_STAMP || BFIN527_EZKIT || BFIN527_EZKIT_V2 || BFIN548_EZKIT || BFIN548_BLUETECHNIX_CM || BFIN538_EZKIT)
default "22" if BFIN533_BLUETECHNIX_CM
default "20" if (BFIN537_BLUETECHNIX_CM_E || BFIN537_BLUETECHNIX_CM_U || BFIN527_BLUETECHNIX_CM || BFIN561_BLUETECHNIX_CM)
default "20" if (BFIN561_EZKIT || BF609)
default "16" if (H8606_HVSISTEMAS || BLACKSTAMP || BFIN526_EZBRD || BFIN518F_EZBRD)
default "25" if BFIN527_AD7160EVAL
help
This controls the frequency of the on-chip PLL. This can be between 1 and 64.
PLL Frequency = (Crystal Frequency) * (this setting)
choice
prompt "Core Clock Divider"
depends on BFIN_KERNEL_CLOCK
default CCLK_DIV_1
help
This sets the frequency of the core. It can be 1, 2, 4 or 8
Core Frequency = (PLL frequency) / (this setting)
config CCLK_DIV_1
bool "1"
config CCLK_DIV_2
bool "2"
config CCLK_DIV_4
bool "4"
config CCLK_DIV_8
bool "8"
endchoice
config SCLK_DIV
int "System Clock Divider"
depends on BFIN_KERNEL_CLOCK
range 1 15
default 4
help
This sets the frequency of the system clock (including SDRAM or DDR) on
!BF60x else it set the clock for system buses and provides the
source from which SCLK0 and SCLK1 are derived.
This can be between 1 and 15
System Clock = (PLL frequency) / (this setting)
config SCLK0_DIV
int "System Clock0 Divider"
depends on BFIN_KERNEL_CLOCK && BF60x
range 1 15
default 1
help
This sets the frequency of the system clock0 for PVP and all other
peripherals not clocked by SCLK1.
This can be between 1 and 15
System Clock0 = (System Clock) / (this setting)
config SCLK1_DIV
int "System Clock1 Divider"
depends on BFIN_KERNEL_CLOCK && BF60x
range 1 15
default 1
help
This sets the frequency of the system clock1 (including SPORT, SPI and ACM).
This can be between 1 and 15
System Clock1 = (System Clock) / (this setting)
config DCLK_DIV
int "DDR Clock Divider"
depends on BFIN_KERNEL_CLOCK && BF60x
range 1 15
default 2
help
This sets the frequency of the DDR memory.
This can be between 1 and 15
DDR Clock = (PLL frequency) / (this setting)
choice
prompt "DDR SDRAM Chip Type"
depends on BFIN_KERNEL_CLOCK
depends on BF54x
default MEM_MT46V32M16_5B
config MEM_MT46V32M16_6T
bool "MT46V32M16_6T"
config MEM_MT46V32M16_5B
bool "MT46V32M16_5B"
endchoice
choice
prompt "DDR/SDRAM Timing"
depends on BFIN_KERNEL_CLOCK && !BF60x
default BFIN_KERNEL_CLOCK_MEMINIT_CALC
help
This option allows you to specify Blackfin SDRAM/DDR Timing parameters
The calculated SDRAM timing parameters may not be 100%
accurate - This option is therefore marked experimental.
config BFIN_KERNEL_CLOCK_MEMINIT_CALC
bool "Calculate Timings"
config BFIN_KERNEL_CLOCK_MEMINIT_SPEC
bool "Provide accurate Timings based on target SCLK"
help
Please consult the Blackfin Hardware Reference Manuals as well
as the memory device datasheet.
http://docs.blackfin.uclinux.org/doku.php?id=bfin:sdram
endchoice
menu "Memory Init Control"
depends on BFIN_KERNEL_CLOCK_MEMINIT_SPEC
config MEM_DDRCTL0
depends on BF54x
hex "DDRCTL0"
default 0x0
config MEM_DDRCTL1
depends on BF54x
hex "DDRCTL1"
default 0x0
config MEM_DDRCTL2
depends on BF54x
hex "DDRCTL2"
default 0x0
config MEM_EBIU_DDRQUE
depends on BF54x
hex "DDRQUE"
default 0x0
config MEM_SDRRC
depends on !BF54x
hex "SDRRC"
default 0x0
config MEM_SDGCTL
depends on !BF54x
hex "SDGCTL"
default 0x0
endmenu
#
# Max & Min Speeds for various Chips
#
config MAX_VCO_HZ
int
default 400000000 if BF512
default 400000000 if BF514
default 400000000 if BF516
default 400000000 if BF518
default 400000000 if BF522
default 600000000 if BF523
default 400000000 if BF524
default 600000000 if BF525
default 400000000 if BF526
default 600000000 if BF527
default 400000000 if BF531
default 400000000 if BF532
default 750000000 if BF533
default 500000000 if BF534
default 400000000 if BF536
default 600000000 if BF537
default 533333333 if BF538
default 533333333 if BF539
default 600000000 if BF542
default 533333333 if BF544
default 600000000 if BF547
default 600000000 if BF548
default 533333333 if BF549
default 600000000 if BF561
default 800000000 if BF609
config MIN_VCO_HZ
int
default 50000000
config MAX_SCLK_HZ
int
default 200000000 if BF609
default 133333333
config MIN_SCLK_HZ
int
default 27000000
comment "Kernel Timer/Scheduler"
source kernel/Kconfig.hz
config SET_GENERIC_CLOCKEVENTS
bool "Generic clock events"
default y
select GENERIC_CLOCKEVENTS
menu "Clock event device"
depends on GENERIC_CLOCKEVENTS
config TICKSOURCE_GPTMR0
bool "GPTimer0"
depends on !SMP
select BFIN_GPTIMERS
config TICKSOURCE_CORETMR
bool "Core timer"
default y
endmenu
menu "Clock souce"
depends on GENERIC_CLOCKEVENTS
config CYCLES_CLOCKSOURCE
bool "CYCLES"
default y
depends on !BFIN_SCRATCH_REG_CYCLES
depends on !SMP
help
If you say Y here, you will enable support for using the 'cycles'
registers as a clock source. Doing so means you will be unable to
safely write to the 'cycles' register during runtime. You will
still be able to read it (such as for performance monitoring), but
writing the registers will most likely crash the kernel.
config GPTMR0_CLOCKSOURCE
bool "GPTimer0"
select BFIN_GPTIMERS
depends on !TICKSOURCE_GPTMR0
endmenu
comment "Misc"
choice
prompt "Blackfin Exception Scratch Register"
default BFIN_SCRATCH_REG_RETN
help
Select the resource to reserve for the Exception handler:
- RETN: Non-Maskable Interrupt (NMI)
- RETE: Exception Return (JTAG/ICE)
- CYCLES: Performance counter
If you are unsure, please select "RETN".
config BFIN_SCRATCH_REG_RETN
bool "RETN"
help
Use the RETN register in the Blackfin exception handler
as a stack scratch register. This means you cannot
safely use NMI on the Blackfin while running Linux, but
you can debug the system with a JTAG ICE and use the
CYCLES performance registers.
If you are unsure, please select "RETN".
config BFIN_SCRATCH_REG_RETE
bool "RETE"
help
Use the RETE register in the Blackfin exception handler
as a stack scratch register. This means you cannot
safely use a JTAG ICE while debugging a Blackfin board,
but you can safely use the CYCLES performance registers
and the NMI.
If you are unsure, please select "RETN".
config BFIN_SCRATCH_REG_CYCLES
bool "CYCLES"
help
Use the CYCLES register in the Blackfin exception handler
as a stack scratch register. This means you cannot
safely use the CYCLES performance registers on a Blackfin
board at anytime, but you can debug the system with a JTAG
ICE and use the NMI.
If you are unsure, please select "RETN".
endchoice
endmenu
menu "Blackfin Kernel Optimizations"
comment "Memory Optimizations"
config I_ENTRY_L1
bool "Locate interrupt entry code in L1 Memory"
default y
depends on !SMP
help
If enabled, interrupt entry code (STORE/RESTORE CONTEXT) is linked
into L1 instruction memory. (less latency)
config EXCPT_IRQ_SYSC_L1
bool "Locate entire ASM lowlevel exception / interrupt - Syscall and CPLB handler code in L1 Memory"
default y
depends on !SMP
help
If enabled, the entire ASM lowlevel exception and interrupt entry code
(STORE/RESTORE CONTEXT) is linked into L1 instruction memory.
(less latency)
config DO_IRQ_L1
bool "Locate frequently called do_irq dispatcher function in L1 Memory"
default y
depends on !SMP
help
If enabled, the frequently called do_irq dispatcher function is linked
into L1 instruction memory. (less latency)
config CORE_TIMER_IRQ_L1
bool "Locate frequently called timer_interrupt() function in L1 Memory"
default y
depends on !SMP
help
If enabled, the frequently called timer_interrupt() function is linked
into L1 instruction memory. (less latency)
config IDLE_L1
bool "Locate frequently idle function in L1 Memory"
default y
depends on !SMP
help
If enabled, the frequently called idle function is linked
into L1 instruction memory. (less latency)
config SCHEDULE_L1
bool "Locate kernel schedule function in L1 Memory"
default y
depends on !SMP
help
If enabled, the frequently called kernel schedule is linked
into L1 instruction memory. (less latency)
config ARITHMETIC_OPS_L1
bool "Locate kernel owned arithmetic functions in L1 Memory"
default y
depends on !SMP
help
If enabled, arithmetic functions are linked
into L1 instruction memory. (less latency)
config ACCESS_OK_L1
bool "Locate access_ok function in L1 Memory"
default y
depends on !SMP
help
If enabled, the access_ok function is linked
into L1 instruction memory. (less latency)
config MEMSET_L1
bool "Locate memset function in L1 Memory"
default y
depends on !SMP
help
If enabled, the memset function is linked
into L1 instruction memory. (less latency)
config MEMCPY_L1
bool "Locate memcpy function in L1 Memory"
default y
depends on !SMP
help
If enabled, the memcpy function is linked
into L1 instruction memory. (less latency)
config STRCMP_L1
bool "locate strcmp function in L1 Memory"
default y
depends on !SMP
help
If enabled, the strcmp function is linked
into L1 instruction memory (less latency).
config STRNCMP_L1
bool "locate strncmp function in L1 Memory"
default y
depends on !SMP
help
If enabled, the strncmp function is linked
into L1 instruction memory (less latency).
config STRCPY_L1
bool "locate strcpy function in L1 Memory"
default y
depends on !SMP
help
If enabled, the strcpy function is linked
into L1 instruction memory (less latency).
config STRNCPY_L1
bool "locate strncpy function in L1 Memory"
default y
depends on !SMP
help
If enabled, the strncpy function is linked
into L1 instruction memory (less latency).
config SYS_BFIN_SPINLOCK_L1
bool "Locate sys_bfin_spinlock function in L1 Memory"
default y
depends on !SMP
help
If enabled, sys_bfin_spinlock function is linked
into L1 instruction memory. (less latency)
config IP_CHECKSUM_L1
bool "Locate IP Checksum function in L1 Memory"
default n
depends on !SMP
help
If enabled, the IP Checksum function is linked
into L1 instruction memory. (less latency)
config CACHELINE_ALIGNED_L1
bool "Locate cacheline_aligned data to L1 Data Memory"
default y if !BF54x
default n if BF54x
depends on !SMP && !BF531 && !CRC32
help
If enabled, cacheline_aligned data is linked
into L1 data memory. (less latency)
config SYSCALL_TAB_L1
bool "Locate Syscall Table L1 Data Memory"
default n
depends on !SMP && !BF531
help
If enabled, the Syscall LUT is linked
into L1 data memory. (less latency)
config CPLB_SWITCH_TAB_L1
bool "Locate CPLB Switch Tables L1 Data Memory"
default n
depends on !SMP && !BF531
help
If enabled, the CPLB Switch Tables are linked
into L1 data memory. (less latency)
config ICACHE_FLUSH_L1
bool "Locate icache flush funcs in L1 Inst Memory"
default y
help
If enabled, the Blackfin icache flushing functions are linked
into L1 instruction memory.
Note that this might be required to address anomalies, but
these functions are pretty small, so it shouldn't be too bad.
If you are using a processor affected by an anomaly, the build
system will double check for you and prevent it.
config DCACHE_FLUSH_L1
bool "Locate dcache flush funcs in L1 Inst Memory"
default y
depends on !SMP
help
If enabled, the Blackfin dcache flushing functions are linked
into L1 instruction memory.
config APP_STACK_L1
bool "Support locating application stack in L1 Scratch Memory"
default y
depends on !SMP
help
If enabled the application stack can be located in L1
scratch memory (less latency).
Currently only works with FLAT binaries.
config EXCEPTION_L1_SCRATCH
bool "Locate exception stack in L1 Scratch Memory"
default n
depends on !SMP && !APP_STACK_L1
help
Whenever an exception occurs, use the L1 Scratch memory for
stack storage. You cannot place the stacks of FLAT binaries
in L1 when using this option.
If you don't use L1 Scratch, then you should say Y here.
comment "Speed Optimizations"
config BFIN_INS_LOWOVERHEAD
bool "ins[bwl] low overhead, higher interrupt latency"
default y
depends on !SMP
help
Reads on the Blackfin are speculative. In Blackfin terms, this means
they can be interrupted at any time (even after they have been issued
on to the external bus), and re-issued after the interrupt occurs.
For memory - this is not a big deal, since memory does not change if
it sees a read.
If a FIFO is sitting on the end of the read, it will see two reads,
when the core only sees one since the FIFO receives both the read
which is cancelled (and not delivered to the core) and the one which
is re-issued (which is delivered to the core).
To solve this, interrupts are turned off before reads occur to
I/O space. This option controls which the overhead/latency of
controlling interrupts during this time
"n" turns interrupts off every read
(higher overhead, but lower interrupt latency)
"y" turns interrupts off every loop
(low overhead, but longer interrupt latency)
default behavior is to leave this set to on (type "Y"). If you are experiencing
interrupt latency issues, it is safe and OK to turn this off.
endmenu
choice
prompt "Kernel executes from"
help
Choose the memory type that the kernel will be running in.
config RAMKERNEL
bool "RAM"
help
The kernel will be resident in RAM when running.
config ROMKERNEL
bool "ROM"
help
The kernel will be resident in FLASH/ROM when running.
endchoice
# Common code uses "ROMKERNEL" or "XIP_KERNEL", so define both
config XIP_KERNEL
bool
default y
depends on ROMKERNEL
source "mm/Kconfig"