2 * Copyright (C) 2014 Gateworks Corporation
3 * Author: Tim Harvey <tharvey@gateworks.com>
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <asm/arch/crm_regs.h>
11 #include <asm/arch/mx6-ddr.h>
12 #include <asm/arch/mx6-pins.h>
13 #include <asm/arch/sys_proto.h>
14 #include <asm/imx-common/boot_mode.h>
15 #include <asm/imx-common/iomux-v3.h>
16 #include <asm/imx-common/mxc_i2c.h>
17 #include <environment.h>
24 DECLARE_GLOBAL_DATA_PTR
;
26 #define RTT_NOM_120OHM /* use 120ohm Rtt_nom vs 60ohm (lower power) */
27 #define GSC_EEPROM_DDR_SIZE 0x2B /* enum (512,1024,2048) MB */
28 #define GSC_EEPROM_DDR_WIDTH 0x2D /* enum (32,64) bit */
30 /* configure MX6Q/DUAL mmdc DDR io registers */
31 struct mx6dq_iomux_ddr_regs mx6dq_ddr_ioregs
= {
32 /* SDCLK[0:1], CAS, RAS, Reset: Differential input, 40ohm */
33 .dram_sdclk_0
= 0x00020030,
34 .dram_sdclk_1
= 0x00020030,
35 .dram_cas
= 0x00020030,
36 .dram_ras
= 0x00020030,
37 .dram_reset
= 0x00020030,
38 /* SDCKE[0:1]: 100k pull-up */
39 .dram_sdcke0
= 0x00003000,
40 .dram_sdcke1
= 0x00003000,
41 /* SDBA2: pull-up disabled */
42 .dram_sdba2
= 0x00000000,
43 /* SDODT[0:1]: 100k pull-up, 40 ohm */
44 .dram_sdodt0
= 0x00003030,
45 .dram_sdodt1
= 0x00003030,
46 /* SDQS[0:7]: Differential input, 40 ohm */
47 .dram_sdqs0
= 0x00000030,
48 .dram_sdqs1
= 0x00000030,
49 .dram_sdqs2
= 0x00000030,
50 .dram_sdqs3
= 0x00000030,
51 .dram_sdqs4
= 0x00000030,
52 .dram_sdqs5
= 0x00000030,
53 .dram_sdqs6
= 0x00000030,
54 .dram_sdqs7
= 0x00000030,
56 /* DQM[0:7]: Differential input, 40 ohm */
57 .dram_dqm0
= 0x00020030,
58 .dram_dqm1
= 0x00020030,
59 .dram_dqm2
= 0x00020030,
60 .dram_dqm3
= 0x00020030,
61 .dram_dqm4
= 0x00020030,
62 .dram_dqm5
= 0x00020030,
63 .dram_dqm6
= 0x00020030,
64 .dram_dqm7
= 0x00020030,
67 /* configure MX6Q/DUAL mmdc GRP io registers */
68 struct mx6dq_iomux_grp_regs mx6dq_grp_ioregs
= {
70 .grp_ddr_type
= 0x000c0000,
71 .grp_ddrmode_ctl
= 0x00020000,
72 /* disable DDR pullups */
73 .grp_ddrpke
= 0x00000000,
74 /* ADDR[00:16], SDBA[0:1]: 40 ohm */
75 .grp_addds
= 0x00000030,
76 /* CS0/CS1/SDBA2/CKE0/CKE1/SDWE: 40 ohm */
77 .grp_ctlds
= 0x00000030,
78 /* DATA[00:63]: Differential input, 40 ohm */
79 .grp_ddrmode
= 0x00020000,
80 .grp_b0ds
= 0x00000030,
81 .grp_b1ds
= 0x00000030,
82 .grp_b2ds
= 0x00000030,
83 .grp_b3ds
= 0x00000030,
84 .grp_b4ds
= 0x00000030,
85 .grp_b5ds
= 0x00000030,
86 .grp_b6ds
= 0x00000030,
87 .grp_b7ds
= 0x00000030,
90 /* configure MX6SOLO/DUALLITE mmdc DDR io registers */
91 struct mx6sdl_iomux_ddr_regs mx6sdl_ddr_ioregs
= {
92 /* SDCLK[0:1], CAS, RAS, Reset: Differential input, 40ohm */
93 .dram_sdclk_0
= 0x00020030,
94 .dram_sdclk_1
= 0x00020030,
95 .dram_cas
= 0x00020030,
96 .dram_ras
= 0x00020030,
97 .dram_reset
= 0x00020030,
98 /* SDCKE[0:1]: 100k pull-up */
99 .dram_sdcke0
= 0x00003000,
100 .dram_sdcke1
= 0x00003000,
101 /* SDBA2: pull-up disabled */
102 .dram_sdba2
= 0x00000000,
103 /* SDODT[0:1]: 100k pull-up, 40 ohm */
104 .dram_sdodt0
= 0x00003030,
105 .dram_sdodt1
= 0x00003030,
106 /* SDQS[0:7]: Differential input, 40 ohm */
107 .dram_sdqs0
= 0x00000030,
108 .dram_sdqs1
= 0x00000030,
109 .dram_sdqs2
= 0x00000030,
110 .dram_sdqs3
= 0x00000030,
111 .dram_sdqs4
= 0x00000030,
112 .dram_sdqs5
= 0x00000030,
113 .dram_sdqs6
= 0x00000030,
114 .dram_sdqs7
= 0x00000030,
116 /* DQM[0:7]: Differential input, 40 ohm */
117 .dram_dqm0
= 0x00020030,
118 .dram_dqm1
= 0x00020030,
119 .dram_dqm2
= 0x00020030,
120 .dram_dqm3
= 0x00020030,
121 .dram_dqm4
= 0x00020030,
122 .dram_dqm5
= 0x00020030,
123 .dram_dqm6
= 0x00020030,
124 .dram_dqm7
= 0x00020030,
127 /* configure MX6SOLO/DUALLITE mmdc GRP io registers */
128 struct mx6sdl_iomux_grp_regs mx6sdl_grp_ioregs
= {
130 .grp_ddr_type
= 0x000c0000,
131 /* SDQS[0:7]: Differential input, 40 ohm */
132 .grp_ddrmode_ctl
= 0x00020000,
133 /* disable DDR pullups */
134 .grp_ddrpke
= 0x00000000,
135 /* ADDR[00:16], SDBA[0:1]: 40 ohm */
136 .grp_addds
= 0x00000030,
137 /* CS0/CS1/SDBA2/CKE0/CKE1/SDWE: 40 ohm */
138 .grp_ctlds
= 0x00000030,
139 /* DATA[00:63]: Differential input, 40 ohm */
140 .grp_ddrmode
= 0x00020000,
141 .grp_b0ds
= 0x00000030,
142 .grp_b1ds
= 0x00000030,
143 .grp_b2ds
= 0x00000030,
144 .grp_b3ds
= 0x00000030,
145 .grp_b4ds
= 0x00000030,
146 .grp_b5ds
= 0x00000030,
147 .grp_b6ds
= 0x00000030,
148 .grp_b7ds
= 0x00000030,
151 /* MT41K64M16JT-125 (1Gb density) */
152 static struct mx6_ddr3_cfg mt41k64m16jt_125
= {
165 /* MT41K128M16JT-125 (2Gb density) */
166 static struct mx6_ddr3_cfg mt41k128m16jt_125
= {
179 /* MT41K256M16HA-125 (4Gb density) */
180 static struct mx6_ddr3_cfg mt41k256m16ha_125
= {
193 /* MT41K512M16HA-125 (8Gb density) */
194 static struct mx6_ddr3_cfg mt41k512m16ha_125
= {
208 * calibration - these are the various CPU/DDR3 combinations we support
210 static struct mx6_mmdc_calibration mx6sdl_64x16_mmdc_calib
= {
211 /* write leveling calibration determine */
212 .p0_mpwldectrl0
= 0x004C004E,
213 .p0_mpwldectrl1
= 0x00440044,
214 /* Read DQS Gating calibration */
215 .p0_mpdgctrl0
= 0x42440247,
216 .p0_mpdgctrl1
= 0x02310232,
217 /* Read Calibration: DQS delay relative to DQ read access */
218 .p0_mprddlctl
= 0x45424746,
219 /* Write Calibration: DQ/DM delay relative to DQS write access */
220 .p0_mpwrdlctl
= 0x33382C31,
223 static struct mx6_mmdc_calibration mx6dq_256x16_mmdc_calib
= {
224 /* write leveling calibration determine */
225 .p0_mpwldectrl0
= 0x001B0016,
226 .p0_mpwldectrl1
= 0x000C000E,
227 /* Read DQS Gating calibration */
228 .p0_mpdgctrl0
= 0x4324033A,
229 .p0_mpdgctrl1
= 0x00000000,
230 /* Read Calibration: DQS delay relative to DQ read access */
231 .p0_mprddlctl
= 0x40403438,
232 /* Write Calibration: DQ/DM delay relative to DQS write access */
233 .p0_mpwrdlctl
= 0x40403D36,
236 static struct mx6_mmdc_calibration mx6sdl_256x16_mmdc_calib
= {
237 /* write leveling calibration determine */
238 .p0_mpwldectrl0
= 0x00420043,
239 .p0_mpwldectrl1
= 0x0016001A,
240 /* Read DQS Gating calibration */
241 .p0_mpdgctrl0
= 0x4238023B,
242 .p0_mpdgctrl1
= 0x00000000,
243 /* Read Calibration: DQS delay relative to DQ read access */
244 .p0_mprddlctl
= 0x40404849,
245 /* Write Calibration: DQ/DM delay relative to DQS write access */
246 .p0_mpwrdlctl
= 0x40402E2F,
249 static struct mx6_mmdc_calibration mx6dq_128x32_mmdc_calib
= {
250 /* write leveling calibration determine */
251 .p0_mpwldectrl0
= 0x00190017,
252 .p0_mpwldectrl1
= 0x00140026,
253 /* Read DQS Gating calibration */
254 .p0_mpdgctrl0
= 0x43380347,
255 .p0_mpdgctrl1
= 0x433C034D,
256 /* Read Calibration: DQS delay relative to DQ read access */
257 .p0_mprddlctl
= 0x3C313539,
258 /* Write Calibration: DQ/DM delay relative to DQS write access */
259 .p0_mpwrdlctl
= 0x36393C39,
262 static struct mx6_mmdc_calibration mx6sdl_128x32_mmdc_calib
= {
263 /* write leveling calibration determine */
264 .p0_mpwldectrl0
= 0x003C003C,
265 .p0_mpwldectrl1
= 0x001F002A,
266 /* Read DQS Gating calibration */
267 .p0_mpdgctrl0
= 0x42410244,
268 .p0_mpdgctrl1
= 0x4234023A,
269 /* Read Calibration: DQS delay relative to DQ read access */
270 .p0_mprddlctl
= 0x484A4C4B,
271 /* Write Calibration: DQ/DM delay relative to DQS write access */
272 .p0_mpwrdlctl
= 0x33342B32,
275 static struct mx6_mmdc_calibration mx6dq_128x64_mmdc_calib
= {
276 /* write leveling calibration determine */
277 .p0_mpwldectrl0
= 0x00190017,
278 .p0_mpwldectrl1
= 0x00140026,
279 .p1_mpwldectrl0
= 0x0021001C,
280 .p1_mpwldectrl1
= 0x0011001D,
281 /* Read DQS Gating calibration */
282 .p0_mpdgctrl0
= 0x43380347,
283 .p0_mpdgctrl1
= 0x433C034D,
284 .p1_mpdgctrl0
= 0x032C0324,
285 .p1_mpdgctrl1
= 0x03310232,
286 /* Read Calibration: DQS delay relative to DQ read access */
287 .p0_mprddlctl
= 0x3C313539,
288 .p1_mprddlctl
= 0x37343141,
289 /* Write Calibration: DQ/DM delay relative to DQS write access */
290 .p0_mpwrdlctl
= 0x36393C39,
291 .p1_mpwrdlctl
= 0x42344438,
294 static struct mx6_mmdc_calibration mx6sdl_128x64_mmdc_calib
= {
295 /* write leveling calibration determine */
296 .p0_mpwldectrl0
= 0x003C003C,
297 .p0_mpwldectrl1
= 0x001F002A,
298 .p1_mpwldectrl0
= 0x00330038,
299 .p1_mpwldectrl1
= 0x0022003F,
300 /* Read DQS Gating calibration */
301 .p0_mpdgctrl0
= 0x42410244,
302 .p0_mpdgctrl1
= 0x4234023A,
303 .p1_mpdgctrl0
= 0x022D022D,
304 .p1_mpdgctrl1
= 0x021C0228,
305 /* Read Calibration: DQS delay relative to DQ read access */
306 .p0_mprddlctl
= 0x484A4C4B,
307 .p1_mprddlctl
= 0x4B4D4E4B,
308 /* Write Calibration: DQ/DM delay relative to DQS write access */
309 .p0_mpwrdlctl
= 0x33342B32,
310 .p1_mpwrdlctl
= 0x3933332B,
313 static struct mx6_mmdc_calibration mx6dq_256x32_mmdc_calib
= {
314 /* write leveling calibration determine */
315 .p0_mpwldectrl0
= 0x001E001A,
316 .p0_mpwldectrl1
= 0x0026001F,
317 /* Read DQS Gating calibration */
318 .p0_mpdgctrl0
= 0x43370349,
319 .p0_mpdgctrl1
= 0x032D0327,
320 /* Read Calibration: DQS delay relative to DQ read access */
321 .p0_mprddlctl
= 0x3D303639,
322 /* Write Calibration: DQ/DM delay relative to DQS write access */
323 .p0_mpwrdlctl
= 0x32363934,
326 static struct mx6_mmdc_calibration mx6sdl_256x32_mmdc_calib
= {
327 /* write leveling calibration determine */
328 .p0_mpwldectrl0
= 0X00480047,
329 .p0_mpwldectrl1
= 0X003D003F,
330 /* Read DQS Gating calibration */
331 .p0_mpdgctrl0
= 0X423E0241,
332 .p0_mpdgctrl1
= 0X022B022C,
333 /* Read Calibration: DQS delay relative to DQ read access */
334 .p0_mprddlctl
= 0X49454A4A,
335 /* Write Calibration: DQ/DM delay relative to DQS write access */
336 .p0_mpwrdlctl
= 0X2E372C32,
339 static struct mx6_mmdc_calibration mx6dq_256x64_mmdc_calib
= {
340 /* write leveling calibration determine */
341 .p0_mpwldectrl0
= 0X00220021,
342 .p0_mpwldectrl1
= 0X00200030,
343 .p1_mpwldectrl0
= 0X002D0027,
344 .p1_mpwldectrl1
= 0X00150026,
345 /* Read DQS Gating calibration */
346 .p0_mpdgctrl0
= 0x43330342,
347 .p0_mpdgctrl1
= 0x0339034A,
348 .p1_mpdgctrl0
= 0x032F0325,
349 .p1_mpdgctrl1
= 0x032F022E,
350 /* Read Calibration: DQS delay relative to DQ read access */
351 .p0_mprddlctl
= 0X3A2E3437,
352 .p1_mprddlctl
= 0X35312F3F,
353 /* Write Calibration: DQ/DM delay relative to DQS write access */
354 .p0_mpwrdlctl
= 0X33363B37,
355 .p1_mpwrdlctl
= 0X40304239,
358 static struct mx6_mmdc_calibration mx6dq_512x32_mmdc_calib
= {
359 /* write leveling calibration determine */
360 .p0_mpwldectrl0
= 0x002A0025,
361 .p0_mpwldectrl1
= 0x003A002A,
362 /* Read DQS Gating calibration */
363 .p0_mpdgctrl0
= 0x43430356,
364 .p0_mpdgctrl1
= 0x033C0335,
365 /* Read Calibration: DQS delay relative to DQ read access */
366 .p0_mprddlctl
= 0x4B373F42,
367 /* Write Calibration: DQ/DM delay relative to DQS write access */
368 .p0_mpwrdlctl
= 0x303E3C36,
371 static void spl_dram_init(int width
, int size_mb
, int board_model
)
373 struct mx6_ddr3_cfg
*mem
= NULL
;
374 struct mx6_mmdc_calibration
*calib
= NULL
;
375 struct mx6_ddr_sysinfo sysinfo
= {
376 /* width of data bus:0=16,1=32,2=64 */
378 /* config for full 4GB range so that get_mem_size() works */
379 .cs_density
= 32, /* 32Gb per CS */
380 /* single chip select */
383 .rtt_wr
= 1 /*DDR3_RTT_60_OHM*/, /* RTT_Wr = RZQ/4 */
384 #ifdef RTT_NOM_120OHM
385 .rtt_nom
= 2 /*DDR3_RTT_120_OHM*/, /* RTT_Nom = RZQ/2 */
387 .rtt_nom
= 1 /*DDR3_RTT_60_OHM*/, /* RTT_Nom = RZQ/4 */
389 .walat
= 1, /* Write additional latency */
390 .ralat
= 5, /* Read additional latency */
391 .mif3_mode
= 3, /* Command prediction working mode */
392 .bi_on
= 1, /* Bank interleaving enabled */
393 .sde_to_rst
= 0x10, /* 14 cycles, 200us (JEDEC default) */
394 .rst_to_cke
= 0x23, /* 33 cycles, 500us (JEDEC default) */
395 .pd_fast_exit
= 1, /* enable precharge power-down fast exit */
396 .ddr_type
= DDR_TYPE_DDR3
,
397 .refsel
= 1, /* Refresh cycles at 32KHz */
398 .refr
= 7, /* 8 refresh commands per refresh cycle */
402 * MMDC Calibration requires the following data:
403 * mx6_mmdc_calibration - board-specific calibration (routing delays)
404 * these calibration values depend on board routing, SoC, and DDR
405 * mx6_ddr_sysinfo - board-specific memory architecture (width/cs/etc)
406 * mx6_ddr_cfg - chip specific timing/layout details
408 if (width
== 16 && size_mb
== 128) {
409 mem
= &mt41k64m16jt_125
;
410 if (is_cpu_type(MXC_CPU_MX6Q
))
413 calib
= &mx6sdl_64x16_mmdc_calib
;
414 debug("1gB density\n");
415 } else if (width
== 16 && size_mb
== 256) {
416 /* 1x 2Gb density chip - same calib as 2x 2Gb */
417 mem
= &mt41k128m16jt_125
;
418 if (is_cpu_type(MXC_CPU_MX6Q
))
419 calib
= &mx6dq_128x32_mmdc_calib
;
421 calib
= &mx6sdl_128x32_mmdc_calib
;
422 debug("2gB density\n");
423 } else if (width
== 16 && size_mb
== 512) {
424 mem
= &mt41k256m16ha_125
;
425 if (is_cpu_type(MXC_CPU_MX6Q
))
426 calib
= &mx6dq_256x16_mmdc_calib
;
428 calib
= &mx6sdl_256x16_mmdc_calib
;
429 debug("4gB density\n");
430 } else if (width
== 32 && size_mb
== 256) {
431 /* Same calib as width==16, size==128 */
432 mem
= &mt41k64m16jt_125
;
433 if (is_cpu_type(MXC_CPU_MX6Q
))
436 calib
= &mx6sdl_64x16_mmdc_calib
;
437 debug("1gB density\n");
438 } else if (width
== 32 && size_mb
== 512) {
439 mem
= &mt41k128m16jt_125
;
440 if (is_cpu_type(MXC_CPU_MX6Q
))
441 calib
= &mx6dq_128x32_mmdc_calib
;
443 calib
= &mx6sdl_128x32_mmdc_calib
;
444 debug("2gB density\n");
445 } else if (width
== 32 && size_mb
== 1024) {
446 mem
= &mt41k256m16ha_125
;
447 if (is_cpu_type(MXC_CPU_MX6Q
))
448 calib
= &mx6dq_256x32_mmdc_calib
;
450 calib
= &mx6sdl_256x32_mmdc_calib
;
451 debug("4gB density\n");
452 } else if (width
== 32 && size_mb
== 2048) {
453 mem
= &mt41k512m16ha_125
;
454 if (is_cpu_type(MXC_CPU_MX6Q
))
455 calib
= &mx6dq_512x32_mmdc_calib
;
456 debug("8gB density\n");
457 } else if (width
== 64 && size_mb
== 512) {
458 mem
= &mt41k64m16jt_125
;
459 debug("1gB density\n");
460 } else if (width
== 64 && size_mb
== 1024) {
461 mem
= &mt41k128m16jt_125
;
462 if (is_cpu_type(MXC_CPU_MX6Q
))
463 calib
= &mx6dq_128x64_mmdc_calib
;
465 calib
= &mx6sdl_128x64_mmdc_calib
;
466 debug("2gB density\n");
467 } else if (width
== 64 && size_mb
== 2048) {
468 mem
= &mt41k256m16ha_125
;
469 if (is_cpu_type(MXC_CPU_MX6Q
))
470 calib
= &mx6dq_256x64_mmdc_calib
;
471 debug("4gB density\n");
474 if (!(mem
&& calib
)) {
475 puts("Error: Invalid Calibration/Board Configuration\n");
476 printf("MEM : %s\n", mem
? "OKAY" : "NULL");
477 printf("CALIB : %s\n", calib
? "OKAY" : "NULL");
478 printf("CPUTYPE: %s\n",
479 is_cpu_type(MXC_CPU_MX6Q
) ? "IMX6Q" : "IMX6DL");
480 printf("SIZE_MB: %d\n", size_mb
);
481 printf("WIDTH : %d\n", width
);
485 if (is_cpu_type(MXC_CPU_MX6Q
))
486 mx6dq_dram_iocfg(width
, &mx6dq_ddr_ioregs
,
489 mx6sdl_dram_iocfg(width
, &mx6sdl_ddr_ioregs
,
491 mx6_dram_cfg(&sysinfo
, calib
, mem
);
494 static void ccgr_init(void)
496 struct mxc_ccm_reg
*ccm
= (struct mxc_ccm_reg
*)CCM_BASE_ADDR
;
498 writel(0x00C03F3F, &ccm
->CCGR0
);
499 writel(0x0030FC03, &ccm
->CCGR1
);
500 writel(0x0FFFC000, &ccm
->CCGR2
);
501 writel(0x3FF00000, &ccm
->CCGR3
);
502 writel(0xFFFFF300, &ccm
->CCGR4
); /* enable NAND/GPMI/BCH clks */
503 writel(0x0F0000C3, &ccm
->CCGR5
);
504 writel(0x000003FF, &ccm
->CCGR6
);
507 static void gpr_init(void)
509 struct iomuxc
*iomux
= (struct iomuxc
*)IOMUXC_BASE_ADDR
;
511 /* enable AXI cache for VDOA/VPU/IPU */
512 writel(0xF00000CF, &iomux
->gpr
[4]);
513 /* set IPU AXI-id0 Qos=0xf(bypass) AXI-id1 Qos=0x7 */
514 writel(0x007F007F, &iomux
->gpr
[6]);
515 writel(0x007F007F, &iomux
->gpr
[7]);
519 * called from C runtime startup code (arch/arm/lib/crt0.S:_main)
520 * - we have a stack and a place to store GD, both in SRAM
521 * - no variable global data is available
523 void board_init_f(ulong dummy
)
525 struct ventana_board_info ventana_info
;
528 /* setup clock gating */
531 /* setup AIPS and disable watchdog */
537 /* iomux and setup of i2c */
544 /* UART clocks enabled and gd valid - init serial console */
545 preloader_console_init();
547 /* read/validate EEPROM info to determine board model and SDRAM cfg */
548 board_model
= read_eeprom(CONFIG_I2C_GSC
, &ventana_info
);
550 /* configure model-specific gpio */
551 setup_iomux_gpio(board_model
, &ventana_info
);
553 /* provide some some default: 32bit 128MB */
554 if (GW_UNKNOWN
== board_model
)
557 /* configure MMDC for SDRAM width/size and per-model calibration */
558 spl_dram_init(8 << ventana_info
.sdram_width
,
559 16 << ventana_info
.sdram_size
,
563 memset(__bss_start
, 0, __bss_end
- __bss_start
);
566 /* called from board_init_r after gd setup if CONFIG_SPL_BOARD_INIT defined */
567 /* its our chance to print info about boot device */
568 void spl_board_init(void)
570 /* determine boot device from SRC_SBMR1 (BOOT_CFG[4:1]) or SRC_GPR9 */
571 u32 boot_device
= spl_boot_device();
573 switch (boot_device
) {
574 case BOOT_DEVICE_MMC1
:
575 puts("Booting from MMC\n");
577 case BOOT_DEVICE_NAND
:
578 puts("Booting from NAND\n");
580 case BOOT_DEVICE_SATA
:
581 puts("Booting from SATA\n");
584 puts("Unknown boot device\n");
591 #ifdef CONFIG_SPL_OS_BOOT
592 /* return 1 if we wish to boot to uboot vs os (falcon mode) */
593 int spl_start_uboot(void)
595 unsigned char ret
= 1;
597 debug("%s\n", __func__
);
598 #ifdef CONFIG_SPL_ENV_SUPPORT
601 debug("boot_os=%s\n", getenv("boot_os"));
602 if (getenv_yesno("boot_os") == 1)
605 /* use i2c-0:0x50:0x00 for falcon boot mode (0=linux, else uboot) */
607 gsc_i2c_read(0x50, 0x0, 1, &ret
, 1);
610 gsc_boot_wd_disable();
612 debug("%s booting %s\n", __func__
, ret
? "uboot" : "linux");