This repository has been archived by the owner on Nov 1, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 38
/
Kconfig
1267 lines (1021 loc) · 28.8 KB
/
Kconfig
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
config SYMBOL_PREFIX
string
default "_"
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_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_OPROFILE
select ARCH_WANT_OPTIONAL_GPIOLIB
config GENERIC_CSUM
def_bool y
config GENERIC_BUG
def_bool y
depends on BUG
config ZONE_DMA
def_bool y
config GENERIC_FIND_NEXT_BIT
def_bool y
config GENERIC_HARDIRQS
def_bool y
config GENERIC_IRQ_PROBE
def_bool y
config GENERIC_HARDIRQS_NO__DO_IRQ
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.
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 && HOTPLUG
default y
config IRQ_PER_CPU
bool
depends on SMP
default y
config HAVE_LEGACY_PER_CPU_AREA
def_bool y
depends on SMP
config BF_REV_MIN
int
default 0 if (BF51x || BF52x || (BF54x && !BF54xM))
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))
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)
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))
config BF_REV_0_1
bool "0.1"
depends on (BF51x || BF52x || (BF54x && !BF54xM))
config BF_REV_0_2
bool "0.2"
depends on (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)
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 MEM_GENERIC_BOARD
bool
depends on GENERIC_BOARD
default y
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)
default y
config MEM_MT48H32M16LFCJ_75
bool
depends on (BFIN526_EZBRD)
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"
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 ROM_BASE
hex "Kernel ROM Base"
depends on ROMKERNEL
default "0x20040040"
range 0x20000000 0x20400000 if !(BF54x || BF561)
range 0x20000000 0x30000000 if (BF54x || BF561)
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
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
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
default "16" if (H8606_HVSISTEMAS || BLACKSTAMP || BFIN526_EZBRD || BFIN518F_EZBRD)
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 5
help
This sets the frequency of the system clock (including SDRAM or DDR).
This can be between 1 and 15
System 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
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 (EXPERIMENTAL)"
depends on EXPERIMENTAL
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
config MIN_VCO_HZ
int
default 50000000
config MAX_SCLK_HZ
int
default 133333333
config MIN_SCLK_HZ
int
default 27000000
comment "Kernel Timer/Scheduler"
source kernel/Kconfig.hz
config GENERIC_TIME
def_bool y
config GENERIC_CLOCKEVENTS
bool "Generic clock events"
default y
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
config ARCH_USES_GETTIMEOFFSET
depends on !GENERIC_CLOCKEVENTS
def_bool y
source kernel/time/Kconfig
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"
depends on !SMP
comment "Memory Optimizations"
config I_ENTRY_L1
bool "Locate interrupt entry code in L1 Memory"
default y
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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 !BF531
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 !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 !BF531
help
If enabled, the CPLB Switch Tables are linked
into L1 data memory. (less latency)
config APP_STACK_L1
bool "Support locating application stack in L1 Scratch Memory"
default y
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 !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
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
source "mm/Kconfig"
config BFIN_GPTIMERS
tristate "Enable Blackfin General Purpose Timers API"
default n
help
Enable support for the General Purpose Timers API. If you
are unsure, say N.
To compile this driver as a module, choose M here: the module
will be called gptimers.
choice
prompt "Uncached DMA region"
default DMA_UNCACHED_1M
config DMA_UNCACHED_4M
bool "Enable 4M DMA region"
config DMA_UNCACHED_2M
bool "Enable 2M DMA region"
config DMA_UNCACHED_1M
bool "Enable 1M DMA region"
config DMA_UNCACHED_512K
bool "Enable 512K DMA region"
config DMA_UNCACHED_256K
bool "Enable 256K DMA region"
config DMA_UNCACHED_128K
bool "Enable 128K DMA region"
config DMA_UNCACHED_NONE
bool "Disable DMA region"
endchoice
comment "Cache Support"
config BFIN_ICACHE
bool "Enable ICACHE"
default y
config BFIN_EXTMEM_ICACHEABLE
bool "Enable ICACHE for external memory"
depends on BFIN_ICACHE
default y
config BFIN_L2_ICACHEABLE
bool "Enable ICACHE for L2 SRAM"
depends on BFIN_ICACHE
depends on BF54x || BF561
default n
config BFIN_DCACHE
bool "Enable DCACHE"
default y
config BFIN_DCACHE_BANKA
bool "Enable only 16k BankA DCACHE - BankB is SRAM"
depends on BFIN_DCACHE && !BF531
default n
config BFIN_EXTMEM_DCACHEABLE
bool "Enable DCACHE for external memory"
depends on BFIN_DCACHE
default y
choice
prompt "External memory DCACHE policy"
depends on BFIN_EXTMEM_DCACHEABLE
default BFIN_EXTMEM_WRITEBACK if !SMP
default BFIN_EXTMEM_WRITETHROUGH if SMP
config BFIN_EXTMEM_WRITEBACK
bool "Write back"
depends on !SMP
help
Write Back Policy:
Cached data will be written back to SDRAM only when needed.
This can give a nice increase in performance, but beware of
broken drivers that do not properly invalidate/flush their
cache.
Write Through Policy:
Cached data will always be written back to SDRAM when the
cache is updated. This is a completely safe setting, but
performance is worse than Write Back.
If you are unsure of the options and you want to be safe,
then go with Write Through.
config BFIN_EXTMEM_WRITETHROUGH
bool "Write through"
help
Write Back Policy:
Cached data will be written back to SDRAM only when needed.