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1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2016 Nelson Integration, LLC
4  * Author: Eric Nelson <eric@nelint.com>
5  */
6
7 #include <common.h>
8 #include <asm/io.h>
9 #include <asm/arch/iomux.h>
10 #include <asm/arch/clock.h>
11 #include <asm/arch/crm_regs.h>
12 #include <asm/arch/mx6-ddr.h>
13 #include <asm/arch/mx6-pins.h>
14 #include <asm/arch/sys_proto.h>
15 #include <spl.h>
16
17 DECLARE_GLOBAL_DATA_PTR;
18
19 #define UART_PAD_CTRL  (PAD_CTL_PUS_100K_UP |                   \
20         PAD_CTL_SPEED_MED | PAD_CTL_DSE_40ohm |                 \
21         PAD_CTL_SRE_FAST  | PAD_CTL_HYS)
22
23 static iomux_v3_cfg_t const uart_pads[] = {
24 #ifdef CONFIG_UART2_EIM_D26_27
25         IOMUX_PADS(PAD_EIM_D26__UART2_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
26         IOMUX_PADS(PAD_EIM_D27__UART2_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
27 #elif defined(CONFIG_UART1_CSI0_DAT10_11)
28         IOMUX_PADS(PAD_CSI0_DAT10__UART1_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
29         IOMUX_PADS(PAD_CSI0_DAT11__UART1_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
30 #elif defined(CONFIG_UART1_SD3_DAT6_7)
31         IOMUX_PADS(PAD_SD3_DAT6__UART1_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
32         IOMUX_PADS(PAD_SD3_DAT7__UART1_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
33 #elif defined(CONFIG_UART1_UART1)
34         MX6_PAD_UART1_TXD__UART1_TXD | MUX_PAD_CTRL(UART_PAD_CTRL),
35         MX6_PAD_UART1_RXD__UART1_RXD | MUX_PAD_CTRL(UART_PAD_CTRL),
36 #else
37 #error select UART console pads
38 #endif
39 };
40
41 #ifdef CONFIG_DDR3
42 #define GRP_DDRTYPE     0x000C0000
43 #else
44 #define GRP_DDRTYPE     0x00080000
45 #endif
46
47 /* all existing designs have this disabled */
48 #define DDR_PKE         0
49
50 /* use Kconfig for ODT and DRIVE_STRENGTH */
51 #define DDR_ODT \
52         (CONFIG_DDR_ODT << 8)
53 #define DRAM_DRIVE_STRENGTH \
54         (CONFIG_DRAM_DRIVE_STRENGTH << 3)
55
56 /* configure MX6Q/DUAL mmdc DDR io registers */
57 static struct mx6dq_iomux_ddr_regs const mx6dq_ddr_ioregs = {
58         /* SDCLK[0:1], CAS, RAS, Reset: Differential input, 40ohm */
59         .dram_sdclk_0 = DDR_ODT + DRAM_DRIVE_STRENGTH,
60         .dram_sdclk_1 = DDR_ODT + DRAM_DRIVE_STRENGTH,
61         .dram_cas = DDR_ODT + DRAM_DRIVE_STRENGTH,
62         .dram_ras = DDR_ODT + DRAM_DRIVE_STRENGTH,
63         .dram_reset = DDR_ODT + DRAM_DRIVE_STRENGTH,
64         /* SDCKE[0:1]: 100k pull-up */
65         .dram_sdcke0 = 0x00003000,
66         .dram_sdcke1 = 0x00003000,
67         /* SDBA2: pull-up disabled */
68         .dram_sdba2 = 0x00000000,
69         /* SDODT[0:1]: 100k pull-up, 40 ohm */
70         .dram_sdodt0 = 0x00003000 + DRAM_DRIVE_STRENGTH,
71         .dram_sdodt1 = 0x00003000 + DRAM_DRIVE_STRENGTH,
72         /* SDQS[0:7]: Differential input, 40 ohm */
73         .dram_sdqs0 = DRAM_DRIVE_STRENGTH,
74         .dram_sdqs1 = DRAM_DRIVE_STRENGTH,
75         .dram_sdqs2 = DRAM_DRIVE_STRENGTH,
76         .dram_sdqs3 = DRAM_DRIVE_STRENGTH,
77         .dram_sdqs4 = DRAM_DRIVE_STRENGTH,
78         .dram_sdqs5 = DRAM_DRIVE_STRENGTH,
79         .dram_sdqs6 = DRAM_DRIVE_STRENGTH,
80         .dram_sdqs7 = DRAM_DRIVE_STRENGTH,
81
82         /* DQM[0:7]: Differential input, 40 ohm */
83         .dram_dqm0 = DDR_ODT + DRAM_DRIVE_STRENGTH,
84         .dram_dqm1 = DDR_ODT + DRAM_DRIVE_STRENGTH,
85         .dram_dqm2 = DDR_ODT + DRAM_DRIVE_STRENGTH,
86         .dram_dqm3 = DDR_ODT + DRAM_DRIVE_STRENGTH,
87         .dram_dqm4 = DDR_ODT + DRAM_DRIVE_STRENGTH,
88         .dram_dqm5 = DDR_ODT + DRAM_DRIVE_STRENGTH,
89         .dram_dqm6 = DDR_ODT + DRAM_DRIVE_STRENGTH,
90         .dram_dqm7 = DDR_ODT + DRAM_DRIVE_STRENGTH,
91 };
92
93 /* configure MX6Q/DUAL mmdc GRP io registers */
94 static struct mx6dq_iomux_grp_regs const mx6dq_grp_ioregs = {
95         /* DDR3 */
96         .grp_ddr_type = GRP_DDRTYPE,
97         .grp_ddrmode_ctl = DDR_ODT,
98         /* disable DDR pullups */
99         .grp_ddrpke = DDR_PKE,
100         /* ADDR[00:16], SDBA[0:1]: 40 ohm */
101         .grp_addds = DRAM_DRIVE_STRENGTH,
102         /* CS0/CS1/SDBA2/CKE0/CKE1/SDWE: 40 ohm */
103         .grp_ctlds = DRAM_DRIVE_STRENGTH,
104         /* DATA[00:63]: Differential input, 40 ohm */
105         .grp_ddrmode = DDR_ODT,
106         .grp_b0ds = DRAM_DRIVE_STRENGTH,
107         .grp_b1ds = DRAM_DRIVE_STRENGTH,
108         .grp_b2ds = DRAM_DRIVE_STRENGTH,
109         .grp_b3ds = DRAM_DRIVE_STRENGTH,
110         .grp_b4ds = DRAM_DRIVE_STRENGTH,
111         .grp_b5ds = DRAM_DRIVE_STRENGTH,
112         .grp_b6ds = DRAM_DRIVE_STRENGTH,
113         .grp_b7ds = DRAM_DRIVE_STRENGTH,
114 };
115
116 static struct mx6sdl_iomux_ddr_regs const mx6sdl_ddr_ioregs = {
117         /* SDCLK[0:1], CAS, RAS, Reset: Differential input, 40ohm */
118         .dram_sdclk_0 = DDR_ODT + DRAM_DRIVE_STRENGTH,
119         .dram_sdclk_1 = DDR_ODT + DRAM_DRIVE_STRENGTH,
120         .dram_cas = DDR_ODT + DRAM_DRIVE_STRENGTH,
121         .dram_ras = DDR_ODT + DRAM_DRIVE_STRENGTH,
122         .dram_reset = DDR_ODT + DRAM_DRIVE_STRENGTH,
123         /* SDCKE[0:1]: 100k pull-up */
124         .dram_sdcke0 = 0x00003000,
125         .dram_sdcke1 = 0x00003000,
126         /* SDBA2: pull-up disabled */
127         .dram_sdba2 = 0x00000000,
128         /* SDODT[0:1]: 100k pull-up, 40 ohm */
129         .dram_sdodt0 = 0x00003000 + DRAM_DRIVE_STRENGTH,
130         .dram_sdodt1 = 0x00003000 + DRAM_DRIVE_STRENGTH,
131         /* SDQS[0:7]: Differential input, 40 ohm */
132         .dram_sdqs0 = DRAM_DRIVE_STRENGTH,
133         .dram_sdqs1 = DRAM_DRIVE_STRENGTH,
134         .dram_sdqs2 = DRAM_DRIVE_STRENGTH,
135         .dram_sdqs3 = DRAM_DRIVE_STRENGTH,
136         .dram_sdqs4 = DRAM_DRIVE_STRENGTH,
137         .dram_sdqs5 = DRAM_DRIVE_STRENGTH,
138         .dram_sdqs6 = DRAM_DRIVE_STRENGTH,
139         .dram_sdqs7 = DRAM_DRIVE_STRENGTH,
140
141         /* DQM[0:7]: Differential input, 40 ohm */
142         .dram_dqm0 = DDR_ODT + DRAM_DRIVE_STRENGTH,
143         .dram_dqm1 = DDR_ODT + DRAM_DRIVE_STRENGTH,
144         .dram_dqm2 = DDR_ODT + DRAM_DRIVE_STRENGTH,
145         .dram_dqm3 = DDR_ODT + DRAM_DRIVE_STRENGTH,
146         .dram_dqm4 = DDR_ODT + DRAM_DRIVE_STRENGTH,
147         .dram_dqm5 = DDR_ODT + DRAM_DRIVE_STRENGTH,
148         .dram_dqm6 = DDR_ODT + DRAM_DRIVE_STRENGTH,
149         .dram_dqm7 = DDR_ODT + DRAM_DRIVE_STRENGTH,
150 };
151
152 /* configure MX6SOLO/DUALLITE mmdc GRP io registers */
153 static struct mx6sdl_iomux_grp_regs const mx6sdl_grp_ioregs = {
154         /* DDR3 */
155         .grp_ddr_type = GRP_DDRTYPE,
156         /* SDQS[0:7]: Differential input, 40 ohm */
157         .grp_ddrmode_ctl = DDR_ODT,
158         /* disable DDR pullups */
159         .grp_ddrpke = DDR_PKE,
160         /* ADDR[00:16], SDBA[0:1]: 40 ohm */
161         .grp_addds = DRAM_DRIVE_STRENGTH,
162         /* CS0/CS1/SDBA2/CKE0/CKE1/SDWE: 40 ohm */
163         .grp_ctlds = DRAM_DRIVE_STRENGTH,
164         /* DATA[00:63]: Differential input, 40 ohm */
165         .grp_ddrmode = DDR_ODT,
166         .grp_b0ds = DRAM_DRIVE_STRENGTH,
167         .grp_b1ds = DRAM_DRIVE_STRENGTH,
168         .grp_b2ds = DRAM_DRIVE_STRENGTH,
169         .grp_b3ds = DRAM_DRIVE_STRENGTH,
170         .grp_b4ds = DRAM_DRIVE_STRENGTH,
171         .grp_b5ds = DRAM_DRIVE_STRENGTH,
172         .grp_b6ds = DRAM_DRIVE_STRENGTH,
173         .grp_b7ds = DRAM_DRIVE_STRENGTH,
174 };
175
176 const struct mx6sl_iomux_ddr_regs mx6sl_ddr_ioregs = {
177         .dram_sdqs0 = DRAM_DRIVE_STRENGTH,
178         .dram_sdqs1 = DRAM_DRIVE_STRENGTH,
179         .dram_sdqs2 = DRAM_DRIVE_STRENGTH,
180         .dram_sdqs3 = DRAM_DRIVE_STRENGTH,
181         .dram_dqm0 = DRAM_DRIVE_STRENGTH,
182         .dram_dqm1 = DRAM_DRIVE_STRENGTH,
183         .dram_dqm2 = DRAM_DRIVE_STRENGTH,
184         .dram_dqm3 = DRAM_DRIVE_STRENGTH,
185         .dram_cas  = DRAM_DRIVE_STRENGTH,
186         .dram_ras  = DRAM_DRIVE_STRENGTH,
187         .dram_sdclk_0 = DRAM_DRIVE_STRENGTH,
188         .dram_reset = DRAM_DRIVE_STRENGTH,
189         .dram_sdba2 = 0x00020000,
190         .dram_odt0 = 0x00030000 + DRAM_DRIVE_STRENGTH,
191         .dram_odt1 = 0x00030000 + DRAM_DRIVE_STRENGTH,
192 };
193
194 const struct mx6sl_iomux_grp_regs mx6sl_grp_ioregs = {
195         .grp_b0ds = DRAM_DRIVE_STRENGTH,
196         .grp_b1ds = DRAM_DRIVE_STRENGTH,
197         .grp_b2ds = DRAM_DRIVE_STRENGTH,
198         .grp_b3ds = DRAM_DRIVE_STRENGTH,
199         .grp_addds = DRAM_DRIVE_STRENGTH,
200         .grp_ctlds = DRAM_DRIVE_STRENGTH,
201         .grp_ddrmode_ctl = DDR_ODT,
202         .grp_ddrpke = DDR_PKE,
203         .grp_ddrmode = DDR_ODT,
204         .grp_ddr_type = GRP_DDRTYPE,
205 };
206
207 static struct mx6_ddr_sysinfo const sysinfo = {
208         /* width of data bus:0=16,1=32,2=64 */
209 #if CONFIG_DDRWIDTH == 32
210         .dsize = 1,
211 #elif CONFIG_DDRWIDTH == 64
212         .dsize = 2,
213 #else
214 #error missing CONFIG_DDRWIDTH
215 #endif
216         /* config for full 4GB range so that get_mem_size() works */
217         .cs_density = 32, /* 32Gb per CS */
218
219         /* # of chip selects */
220         .ncs = CONFIG_DDRCS,
221         .cs1_mirror = 0,
222         .bi_on = 1,     /* Bank interleaving enabled */
223         .rtt_nom = CONFIG_RTT_NOM,
224         .rtt_wr = CONFIG_RTT_WR,
225         .ralat = CONFIG_RALAT,  /* Read additional latency */
226         .walat = CONFIG_WALAT,  /* Write additional latency */
227         .mif3_mode = 3, /* Command prediction working mode */
228 #ifdef CONFIG_DDR3
229         .rst_to_cke = 0x23,     /* 33 cycles, 500us (JEDEC default) */
230         .sde_to_rst = 0x10,     /* JEDEC value for LPDDR2 - 200us */
231         .pd_fast_exit = 0,      /* immaterial for calibration */
232         .ddr_type = DDR_TYPE_DDR3,
233 #else
234         .rst_to_cke = 0x10,     /* JEDEC value for LPDDR2: 200us */
235         .sde_to_rst = 0,        /* LPDDR2 does not need this field */
236         .pd_fast_exit = 0,      /* immaterial for calibration */
237         .ddr_type = DDR_TYPE_LPDDR2,
238 #endif
239         .refsel = CONFIG_REFSEL,
240         .refr = CONFIG_REFR,
241 };
242
243 #ifdef CONFIG_MT41K512M16TNA
244 /* Micron MT41K512M16TNA-125 */
245 static struct mx6_ddr3_cfg const ddrtype = {
246         .mem_speed = 1600,
247         .density = 8,
248         .width = 16,
249         .banks = 8,
250         .rowaddr = 15,
251         .coladdr = 10,
252         .pagesz = 1,
253         .trcd = 1375,
254         .trcmin = 5062,
255         .trasmin = 3750,
256 };
257 #elif defined(CONFIG_MT41K128M16JT)
258 /* Micron MT41K128M16JT-125 */
259 static struct mx6_ddr3_cfg const ddrtype = {
260         .mem_speed = 1600,
261         .density = 2,
262         .width = 16,
263         .banks = 8,
264         .rowaddr = 14,
265         .coladdr = 10,
266         .pagesz = 2,
267         .trcd = 1375,
268         .trcmin = 4875,
269         .trasmin = 3500,
270 };
271 #elif defined(CONFIG_H5TQ4G63AFR)
272 /* Hynix H5TQ4G63AFR */
273 static struct mx6_ddr3_cfg const ddrtype = {
274         .mem_speed = 1600,
275         .density = 4,
276         .width = 16,
277         .banks = 8,
278         .rowaddr = 15,
279         .coladdr = 10,
280         .pagesz = 2,
281         .trcd = 1375,
282         .trcmin = 4875,
283         .trasmin = 3500,
284 };
285 #elif defined CONFIG_H5TQ2G63DFR
286 /* Hynix H5TQ2G63DFR */
287 static struct mx6_ddr3_cfg const ddrtype = {
288         .mem_speed = 1333,
289         .density = 2,
290         .width = 16,
291         .banks = 8,
292         .rowaddr = 14,
293         .coladdr = 10,
294         .pagesz = 2,
295         .trcd = 1350,
296         .trcmin = 4950,
297         .trasmin = 3600,
298 };
299 #elif defined(CONFIG_MT42L256M32D2LG)
300 /* Micron MT42L256M32D2LG */
301 static struct mx6_lpddr2_cfg ddrtype = {
302         .mem_speed = 800,
303         .density = 4,
304         .width = 32,
305         .banks = 8,
306         .rowaddr = 14,
307         .coladdr = 10,
308         .trcd_lp = 2000,
309         .trppb_lp = 2000,
310         .trpab_lp = 2250,
311         .trasmin = 4200,
312 };
313 #elif defined(CONFIG_MT29PZZZ4D4BKESK)
314 /* Micron MT29PZZZ4D4BKESK */
315 static struct mx6_lpddr2_cfg ddrtype = {
316         .mem_speed = 800,
317         .density = 4,
318         .width = 32,
319         .banks = 8,
320         .rowaddr = 14,
321         .coladdr = 10,
322         .trcd_lp = 2000,
323         .trppb_lp = 2000,
324         .trpab_lp = 2250,
325         .trasmin = 4200,
326 };
327 #else
328 #error please select DDR type using menuconfig
329 #endif
330
331 static void ccgr_init(void)
332 {
333         struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
334
335         /* FIXME: these should probably be checked, especially
336          * for i.MX6SL, UL, ULL
337          */
338         writel(0x00C03F3F, &ccm->CCGR0);
339         writel(0x0030FC03, &ccm->CCGR1);
340         writel(0x0FFFC000, &ccm->CCGR2);
341         writel(0x3FF00000, &ccm->CCGR3);
342         writel(0x00FFF300, &ccm->CCGR4);
343         writel(0x0F0000C3, &ccm->CCGR5);
344         writel(0x000003FF, &ccm->CCGR6);
345 }
346
347 static void display_calibration(struct mx6_mmdc_calibration *calib)
348 {
349         printf(".p0_mpdgctrl0\t= 0x%08X\n", calib->p0_mpdgctrl0);
350         printf(".p0_mpdgctrl1\t= 0x%08X\n", calib->p0_mpdgctrl1);
351         printf(".p0_mprddlctl\t= 0x%08X\n", calib->p0_mprddlctl);
352         printf(".p0_mpwrdlctl\t= 0x%08X\n", calib->p0_mpwrdlctl);
353         printf(".p0_mpwldectrl0\t= 0x%08X\n", calib->p0_mpwldectrl0);
354         printf(".p0_mpwldectrl1\t= 0x%08X\n", calib->p0_mpwldectrl1);
355         if (sysinfo.dsize == 2) {
356                 printf(".p1_mpdgctrl0\t= 0x%08X\n", calib->p1_mpdgctrl0);
357                 printf(".p1_mpdgctrl1\t= 0x%08X\n", calib->p1_mpdgctrl1);
358                 printf(".p1_mprddlctl\t= 0x%08X\n", calib->p1_mprddlctl);
359                 printf(".p1_mpwrdlctl\t= 0x%08X\n", calib->p1_mpwrdlctl);
360                 printf(".p1_mpwldectrl0\t= 0x%08X\n", calib->p1_mpwldectrl0);
361                 printf(".p1_mpwldectrl1\t= 0x%08X\n", calib->p1_mpwldectrl1);
362         }
363 #ifdef CONFIG_IMXIMAGE_OUTPUT
364         printf("DATA 4 MX6_MMDC_P0_MPDGCTRL0\t= 0x%08X\n", calib->p0_mpdgctrl0);
365         printf("DATA 4 MX6_MMDC_P0_MPDGCTRL1\t= 0x%08X\n", calib->p0_mpdgctrl1);
366         printf("DATA 4 MX6_MMDC_P0_MPRDDLCTL\t= 0x%08X\n", calib->p0_mprddlctl);
367         printf("DATA 4 MX6_MMDC_P0_MPWRDLCTL\t= 0x%08X\n", calib->p0_mpwrdlctl);
368         printf("DATA 4 MX6_MMDC_P0_MPWLDECTRL0\t= 0x%08X\n",
369                calib->p0_mpwldectrl0);
370         printf("DATA 4 MX6_MMDC_P0_MPWLDECTRL1\t= 0x%08X\n",
371                calib->p0_mpwldectrl1);
372         if (sysinfo.dsize == 2) {
373                 printf("DATA 4 MX6_MMDC_P1_MPDGCTRL0\t= 0x%08X\n",
374                        calib->p1_mpdgctrl0);
375                 printf("DATA 4 MX6_MMDC_P1_MPDGCTRL1\t= 0x%08X\n",
376                        calib->p1_mpdgctrl1);
377                 printf("DATA 4 MX6_MMDC_P1_MPRDDLCTL\t= 0x%08X\n",
378                        calib->p1_mprddlctl);
379                 printf("DATA 4 MX6_MMDC_P1_MPWRDLCTL\t= 0x%08X\n",
380                        calib->p1_mpwrdlctl);
381                 printf("DATA 4 MX6_MMDC_P1_MPWLDECTRL0\t= 0x%08X\n",
382                        calib->p1_mpwldectrl0);
383                 printf("DATA 4 MX6_MMDC_P1_MPWLDECTRL1\t= 0x%08X\n",
384                        calib->p1_mpwldectrl1);
385         }
386 #endif
387 }
388
389 /*
390  * called from C runtime startup code (arch/arm/lib/crt0.S:_main)
391  * - we have a stack and a place to store GD, both in SRAM
392  * - no variable global data is available
393  */
394 void board_init_f(ulong dummy)
395 {
396         int errs;
397         struct mx6_mmdc_calibration calibration = {0};
398
399         memset((void *)gd, 0, sizeof(struct global_data));
400
401         /* write leveling calibration defaults */
402         calibration.p0_mpwrdlctl = 0x40404040;
403         calibration.p1_mpwrdlctl = 0x40404040;
404
405         /* setup AIPS and disable watchdog */
406         arch_cpu_init();
407
408         ccgr_init();
409
410         SETUP_IOMUX_PADS(uart_pads);
411
412         /* setup GP timer */
413         timer_init();
414
415         /* UART clocks enabled and gd valid - init serial console */
416         preloader_console_init();
417
418         if (sysinfo.dsize != 1) {
419                 if (is_cpu_type(MXC_CPU_MX6SX) ||
420                     is_cpu_type(MXC_CPU_MX6UL) ||
421                     is_cpu_type(MXC_CPU_MX6ULL) ||
422                     is_cpu_type(MXC_CPU_MX6SL)) {
423                         printf("cpu type 0x%x doesn't support 64-bit bus\n",
424                                get_cpu_type());
425                         reset_cpu(0);
426                 }
427         }
428 #ifdef CONFIG_MX6SL
429         mx6sl_dram_iocfg(CONFIG_DDRWIDTH, &mx6sl_ddr_ioregs,
430                          &mx6sl_grp_ioregs);
431 #else
432         if (is_cpu_type(MXC_CPU_MX6Q)) {
433                 mx6dq_dram_iocfg(CONFIG_DDRWIDTH, &mx6dq_ddr_ioregs,
434                                  &mx6dq_grp_ioregs);
435         } else {
436                 mx6sdl_dram_iocfg(CONFIG_DDRWIDTH, &mx6sdl_ddr_ioregs,
437                                   &mx6sdl_grp_ioregs);
438         }
439 #endif
440         mx6_dram_cfg(&sysinfo, &calibration, &ddrtype);
441
442         errs = mmdc_do_write_level_calibration(&sysinfo);
443         if (errs) {
444                 printf("error %d from write level calibration\n", errs);
445         } else {
446                 errs = mmdc_do_dqs_calibration(&sysinfo);
447                 if (errs) {
448                         printf("error %d from dqs calibration\n", errs);
449                 } else {
450                         printf("completed successfully\n");
451                         mmdc_read_calibration(&sysinfo, &calibration);
452                         display_calibration(&calibration);
453                 }
454         }
455 }