cmd_scsi.c 17 KB

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  1. /*
  2. * (C) Copyright 2001
  3. * Denis Peter, MPL AG Switzerland
  4. *
  5. * See file CREDITS for list of people who contributed to this
  6. * project.
  7. *
  8. * This program is free software; you can redistribute it and/or
  9. * modify it under the terms of the GNU General Public License as
  10. * published by the Free Software Foundation; either version 2 of
  11. * the License, or (at your option) any later version.
  12. *
  13. * This program is distributed in the hope that it will be useful,
  14. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16. * GNU General Public License for more details.
  17. *
  18. * You should have received a copy of the GNU General Public License
  19. * along with this program; if not, write to the Free Software
  20. * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21. * MA 02111-1307 USA
  22. *
  23. *
  24. *
  25. */
  26. /*
  27. * SCSI support.
  28. */
  29. #include <common.h>
  30. #include <command.h>
  31. #include <asm/processor.h>
  32. #include <scsi.h>
  33. #include <image.h>
  34. #include <pci.h>
  35. #ifdef CONFIG_SCSI_SYM53C8XX
  36. #define SCSI_VEND_ID 0x1000
  37. #ifndef CONFIG_SCSI_DEV_ID
  38. #define SCSI_DEV_ID 0x0001
  39. #else
  40. #define SCSI_DEV_ID CONFIG_SCSI_DEV_ID
  41. #endif
  42. #elif defined CONFIG_SATA_ULI5288
  43. #define SCSI_VEND_ID 0x10b9
  44. #define SCSI_DEV_ID 0x5288
  45. #else
  46. #error no scsi device defined
  47. #endif
  48. static ccb tempccb; /* temporary scsi command buffer */
  49. static unsigned char tempbuff[512]; /* temporary data buffer */
  50. static int scsi_max_devs; /* number of highest available scsi device */
  51. static int scsi_curr_dev; /* current device */
  52. static block_dev_desc_t scsi_dev_desc[CONFIG_SYS_SCSI_MAX_DEVICE];
  53. /********************************************************************************
  54. * forward declerations of some Setup Routines
  55. */
  56. void scsi_setup_test_unit_ready(ccb * pccb);
  57. void scsi_setup_read_capacity(ccb * pccb);
  58. void scsi_setup_read6(ccb * pccb, unsigned long start, unsigned short blocks);
  59. void scsi_setup_read_ext(ccb * pccb, unsigned long start, unsigned short blocks);
  60. void scsi_setup_inquiry(ccb * pccb);
  61. void scsi_ident_cpy (unsigned char *dest, unsigned char *src, unsigned int len);
  62. ulong scsi_read(int device, ulong blknr, ulong blkcnt, void *buffer);
  63. /*********************************************************************************
  64. * (re)-scan the scsi bus and reports scsi device info
  65. * to the user if mode = 1
  66. */
  67. void scsi_scan(int mode)
  68. {
  69. unsigned char i,perq,modi,lun;
  70. unsigned long capacity,blksz;
  71. ccb* pccb=(ccb *)&tempccb;
  72. if(mode==1) {
  73. printf("scanning bus for devices...\n");
  74. }
  75. for(i=0;i<CONFIG_SYS_SCSI_MAX_DEVICE;i++) {
  76. scsi_dev_desc[i].target=0xff;
  77. scsi_dev_desc[i].lun=0xff;
  78. scsi_dev_desc[i].lba=0;
  79. scsi_dev_desc[i].blksz=0;
  80. scsi_dev_desc[i].type=DEV_TYPE_UNKNOWN;
  81. scsi_dev_desc[i].vendor[0]=0;
  82. scsi_dev_desc[i].product[0]=0;
  83. scsi_dev_desc[i].revision[0]=0;
  84. scsi_dev_desc[i].removable=FALSE;
  85. scsi_dev_desc[i].if_type=IF_TYPE_SCSI;
  86. scsi_dev_desc[i].dev=i;
  87. scsi_dev_desc[i].part_type=PART_TYPE_UNKNOWN;
  88. scsi_dev_desc[i].block_read=scsi_read;
  89. }
  90. scsi_max_devs=0;
  91. for(i=0;i<CONFIG_SYS_SCSI_MAX_SCSI_ID;i++) {
  92. pccb->target=i;
  93. for(lun=0;lun<CONFIG_SYS_SCSI_MAX_LUN;lun++) {
  94. pccb->lun=lun;
  95. pccb->pdata=(unsigned char *)&tempbuff;
  96. pccb->datalen=512;
  97. scsi_setup_inquiry(pccb);
  98. if(scsi_exec(pccb)!=TRUE) {
  99. if(pccb->contr_stat==SCSI_SEL_TIME_OUT) {
  100. debug ("Selection timeout ID %d\n",pccb->target);
  101. continue; /* selection timeout => assuming no device present */
  102. }
  103. scsi_print_error(pccb);
  104. continue;
  105. }
  106. perq=tempbuff[0];
  107. modi=tempbuff[1];
  108. if((perq & 0x1f)==0x1f) {
  109. continue; /* skip unknown devices */
  110. }
  111. if((modi&0x80)==0x80) /* drive is removable */
  112. scsi_dev_desc[scsi_max_devs].removable=TRUE;
  113. /* get info for this device */
  114. scsi_ident_cpy((unsigned char *)&scsi_dev_desc[scsi_max_devs].vendor[0],
  115. &tempbuff[8], 8);
  116. scsi_ident_cpy((unsigned char *)&scsi_dev_desc[scsi_max_devs].product[0],
  117. &tempbuff[16], 16);
  118. scsi_ident_cpy((unsigned char *)&scsi_dev_desc[scsi_max_devs].revision[0],
  119. &tempbuff[32], 4);
  120. scsi_dev_desc[scsi_max_devs].target=pccb->target;
  121. scsi_dev_desc[scsi_max_devs].lun=pccb->lun;
  122. pccb->datalen=0;
  123. scsi_setup_test_unit_ready(pccb);
  124. if(scsi_exec(pccb)!=TRUE) {
  125. if(scsi_dev_desc[scsi_max_devs].removable==TRUE) {
  126. scsi_dev_desc[scsi_max_devs].type=perq;
  127. goto removable;
  128. }
  129. scsi_print_error(pccb);
  130. continue;
  131. }
  132. pccb->datalen=8;
  133. scsi_setup_read_capacity(pccb);
  134. if(scsi_exec(pccb)!=TRUE) {
  135. scsi_print_error(pccb);
  136. continue;
  137. }
  138. capacity=((unsigned long)tempbuff[0]<<24)|((unsigned long)tempbuff[1]<<16)|
  139. ((unsigned long)tempbuff[2]<<8)|((unsigned long)tempbuff[3]);
  140. blksz=((unsigned long)tempbuff[4]<<24)|((unsigned long)tempbuff[5]<<16)|
  141. ((unsigned long)tempbuff[6]<<8)|((unsigned long)tempbuff[7]);
  142. scsi_dev_desc[scsi_max_devs].lba=capacity;
  143. scsi_dev_desc[scsi_max_devs].blksz=blksz;
  144. scsi_dev_desc[scsi_max_devs].type=perq;
  145. init_part(&scsi_dev_desc[scsi_max_devs]);
  146. removable:
  147. if(mode==1) {
  148. printf (" Device %d: ", scsi_max_devs);
  149. dev_print(&scsi_dev_desc[scsi_max_devs]);
  150. } /* if mode */
  151. scsi_max_devs++;
  152. } /* next LUN */
  153. }
  154. if(scsi_max_devs>0)
  155. scsi_curr_dev=0;
  156. else
  157. scsi_curr_dev = -1;
  158. }
  159. void scsi_init(void)
  160. {
  161. int busdevfunc;
  162. busdevfunc=pci_find_device(SCSI_VEND_ID,SCSI_DEV_ID,0); /* get PCI Device ID */
  163. if(busdevfunc==-1) {
  164. printf("Error SCSI Controller (%04X,%04X) not found\n",SCSI_VEND_ID,SCSI_DEV_ID);
  165. return;
  166. }
  167. #ifdef DEBUG
  168. else {
  169. printf("SCSI Controller (%04X,%04X) found (%d:%d:%d)\n",SCSI_VEND_ID,SCSI_DEV_ID,(busdevfunc>>16)&0xFF,(busdevfunc>>11)&0x1F,(busdevfunc>>8)&0x7);
  170. }
  171. #endif
  172. scsi_low_level_init(busdevfunc);
  173. scsi_scan(1);
  174. }
  175. block_dev_desc_t * scsi_get_dev(int dev)
  176. {
  177. return (dev < CONFIG_SYS_SCSI_MAX_DEVICE) ? &scsi_dev_desc[dev] : NULL;
  178. }
  179. /******************************************************************************
  180. * scsi boot command intepreter. Derived from diskboot
  181. */
  182. int do_scsiboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  183. {
  184. char *boot_device = NULL;
  185. char *ep;
  186. int dev, part = 0;
  187. ulong addr, cnt;
  188. disk_partition_t info;
  189. image_header_t *hdr;
  190. int rcode = 0;
  191. #if defined(CONFIG_FIT)
  192. const void *fit_hdr = NULL;
  193. #endif
  194. switch (argc) {
  195. case 1:
  196. addr = CONFIG_SYS_LOAD_ADDR;
  197. boot_device = getenv ("bootdevice");
  198. break;
  199. case 2:
  200. addr = simple_strtoul(argv[1], NULL, 16);
  201. boot_device = getenv ("bootdevice");
  202. break;
  203. case 3:
  204. addr = simple_strtoul(argv[1], NULL, 16);
  205. boot_device = argv[2];
  206. break;
  207. default:
  208. return cmd_usage(cmdtp);
  209. }
  210. if (!boot_device) {
  211. puts ("\n** No boot device **\n");
  212. return 1;
  213. }
  214. dev = simple_strtoul(boot_device, &ep, 16);
  215. printf("booting from dev %d\n",dev);
  216. if (scsi_dev_desc[dev].type == DEV_TYPE_UNKNOWN) {
  217. printf ("\n** Device %d not available\n", dev);
  218. return 1;
  219. }
  220. if (*ep) {
  221. if (*ep != ':') {
  222. puts ("\n** Invalid boot device, use `dev[:part]' **\n");
  223. return 1;
  224. }
  225. part = simple_strtoul(++ep, NULL, 16);
  226. }
  227. if (get_partition_info (&scsi_dev_desc[dev], part, &info)) {
  228. printf("error reading partinfo\n");
  229. return 1;
  230. }
  231. if ((strncmp((char *)(info.type), BOOT_PART_TYPE, sizeof(info.type)) != 0) &&
  232. (strncmp((char *)(info.type), BOOT_PART_COMP, sizeof(info.type)) != 0)) {
  233. printf ("\n** Invalid partition type \"%.32s\""
  234. " (expect \"" BOOT_PART_TYPE "\")\n",
  235. info.type);
  236. return 1;
  237. }
  238. printf ("\nLoading from SCSI device %d, partition %d: "
  239. "Name: %.32s Type: %.32s\n",
  240. dev, part, info.name, info.type);
  241. debug ("First Block: %ld, # of blocks: %ld, Block Size: %ld\n",
  242. info.start, info.size, info.blksz);
  243. if (scsi_read (dev, info.start, 1, (ulong *)addr) != 1) {
  244. printf ("** Read error on %d:%d\n", dev, part);
  245. return 1;
  246. }
  247. switch (genimg_get_format ((void *)addr)) {
  248. case IMAGE_FORMAT_LEGACY:
  249. hdr = (image_header_t *)addr;
  250. if (!image_check_hcrc (hdr)) {
  251. puts ("\n** Bad Header Checksum **\n");
  252. return 1;
  253. }
  254. image_print_contents (hdr);
  255. cnt = image_get_image_size (hdr);
  256. break;
  257. #if defined(CONFIG_FIT)
  258. case IMAGE_FORMAT_FIT:
  259. fit_hdr = (const void *)addr;
  260. puts ("Fit image detected...\n");
  261. cnt = fit_get_size (fit_hdr);
  262. break;
  263. #endif
  264. default:
  265. puts ("** Unknown image type\n");
  266. return 1;
  267. }
  268. cnt += info.blksz - 1;
  269. cnt /= info.blksz;
  270. cnt -= 1;
  271. if (scsi_read (dev, info.start+1, cnt,
  272. (ulong *)(addr+info.blksz)) != cnt) {
  273. printf ("** Read error on %d:%d\n", dev, part);
  274. return 1;
  275. }
  276. #if defined(CONFIG_FIT)
  277. /* This cannot be done earlier, we need complete FIT image in RAM first */
  278. if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
  279. if (!fit_check_format (fit_hdr)) {
  280. puts ("** Bad FIT image format\n");
  281. return 1;
  282. }
  283. fit_print_contents (fit_hdr);
  284. }
  285. #endif
  286. /* Loading ok, update default load address */
  287. load_addr = addr;
  288. flush_cache (addr, (cnt+1)*info.blksz);
  289. /* Check if we should attempt an auto-start */
  290. if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
  291. char *local_args[2];
  292. extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
  293. local_args[0] = argv[0];
  294. local_args[1] = NULL;
  295. printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
  296. rcode = do_bootm (cmdtp, 0, 1, local_args);
  297. }
  298. return rcode;
  299. }
  300. /*********************************************************************************
  301. * scsi command intepreter
  302. */
  303. int do_scsi (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
  304. {
  305. switch (argc) {
  306. case 0:
  307. case 1: return cmd_usage(cmdtp);
  308. case 2:
  309. if (strncmp(argv[1],"res",3) == 0) {
  310. printf("\nReset SCSI\n");
  311. scsi_bus_reset();
  312. scsi_scan(1);
  313. return 0;
  314. }
  315. if (strncmp(argv[1],"inf",3) == 0) {
  316. int i;
  317. for (i=0; i<CONFIG_SYS_SCSI_MAX_DEVICE; ++i) {
  318. if(scsi_dev_desc[i].type==DEV_TYPE_UNKNOWN)
  319. continue; /* list only known devices */
  320. printf ("SCSI dev. %d: ", i);
  321. dev_print(&scsi_dev_desc[i]);
  322. }
  323. return 0;
  324. }
  325. if (strncmp(argv[1],"dev",3) == 0) {
  326. if ((scsi_curr_dev < 0) || (scsi_curr_dev >= CONFIG_SYS_SCSI_MAX_DEVICE)) {
  327. printf("\nno SCSI devices available\n");
  328. return 1;
  329. }
  330. printf ("\n Device %d: ", scsi_curr_dev);
  331. dev_print(&scsi_dev_desc[scsi_curr_dev]);
  332. return 0;
  333. }
  334. if (strncmp(argv[1],"scan",4) == 0) {
  335. scsi_scan(1);
  336. return 0;
  337. }
  338. if (strncmp(argv[1],"part",4) == 0) {
  339. int dev, ok;
  340. for (ok=0, dev=0; dev<CONFIG_SYS_SCSI_MAX_DEVICE; ++dev) {
  341. if (scsi_dev_desc[dev].type!=DEV_TYPE_UNKNOWN) {
  342. ok++;
  343. if (dev)
  344. printf("\n");
  345. debug ("print_part of %x\n",dev);
  346. print_part(&scsi_dev_desc[dev]);
  347. }
  348. }
  349. if (!ok)
  350. printf("\nno SCSI devices available\n");
  351. return 1;
  352. }
  353. return cmd_usage(cmdtp);
  354. case 3:
  355. if (strncmp(argv[1],"dev",3) == 0) {
  356. int dev = (int)simple_strtoul(argv[2], NULL, 10);
  357. printf ("\nSCSI device %d: ", dev);
  358. if (dev >= CONFIG_SYS_SCSI_MAX_DEVICE) {
  359. printf("unknown device\n");
  360. return 1;
  361. }
  362. printf ("\n Device %d: ", dev);
  363. dev_print(&scsi_dev_desc[dev]);
  364. if(scsi_dev_desc[dev].type == DEV_TYPE_UNKNOWN) {
  365. return 1;
  366. }
  367. scsi_curr_dev = dev;
  368. printf("... is now current device\n");
  369. return 0;
  370. }
  371. if (strncmp(argv[1],"part",4) == 0) {
  372. int dev = (int)simple_strtoul(argv[2], NULL, 10);
  373. if(scsi_dev_desc[dev].type != DEV_TYPE_UNKNOWN) {
  374. print_part(&scsi_dev_desc[dev]);
  375. }
  376. else {
  377. printf ("\nSCSI device %d not available\n", dev);
  378. }
  379. return 1;
  380. }
  381. return cmd_usage(cmdtp);
  382. default:
  383. /* at least 4 args */
  384. if (strcmp(argv[1],"read") == 0) {
  385. ulong addr = simple_strtoul(argv[2], NULL, 16);
  386. ulong blk = simple_strtoul(argv[3], NULL, 16);
  387. ulong cnt = simple_strtoul(argv[4], NULL, 16);
  388. ulong n;
  389. printf ("\nSCSI read: device %d block # %ld, count %ld ... ",
  390. scsi_curr_dev, blk, cnt);
  391. n = scsi_read(scsi_curr_dev, blk, cnt, (ulong *)addr);
  392. printf ("%ld blocks read: %s\n",n,(n==cnt) ? "OK" : "ERROR");
  393. return 0;
  394. }
  395. } /* switch */
  396. return cmd_usage(cmdtp);
  397. }
  398. /****************************************************************************************
  399. * scsi_read
  400. */
  401. #define SCSI_MAX_READ_BLK 0xFFFF /* almost the maximum amount of the scsi_ext command.. */
  402. ulong scsi_read(int device, ulong blknr, ulong blkcnt, void *buffer)
  403. {
  404. ulong start,blks, buf_addr;
  405. unsigned short smallblks;
  406. ccb* pccb=(ccb *)&tempccb;
  407. device&=0xff;
  408. /* Setup device
  409. */
  410. pccb->target=scsi_dev_desc[device].target;
  411. pccb->lun=scsi_dev_desc[device].lun;
  412. buf_addr=(unsigned long)buffer;
  413. start=blknr;
  414. blks=blkcnt;
  415. debug ("\nscsi_read: dev %d startblk %lx, blccnt %lx buffer %lx\n",device,start,blks,(unsigned long)buffer);
  416. do {
  417. pccb->pdata=(unsigned char *)buf_addr;
  418. if(blks>SCSI_MAX_READ_BLK) {
  419. pccb->datalen=scsi_dev_desc[device].blksz * SCSI_MAX_READ_BLK;
  420. smallblks=SCSI_MAX_READ_BLK;
  421. scsi_setup_read_ext(pccb,start,smallblks);
  422. start+=SCSI_MAX_READ_BLK;
  423. blks-=SCSI_MAX_READ_BLK;
  424. }
  425. else {
  426. pccb->datalen=scsi_dev_desc[device].blksz * blks;
  427. smallblks=(unsigned short) blks;
  428. scsi_setup_read_ext(pccb,start,smallblks);
  429. start+=blks;
  430. blks=0;
  431. }
  432. debug ("scsi_read_ext: startblk %lx, blccnt %x buffer %lx\n",start,smallblks,buf_addr);
  433. if(scsi_exec(pccb)!=TRUE) {
  434. scsi_print_error(pccb);
  435. blkcnt-=blks;
  436. break;
  437. }
  438. buf_addr+=pccb->datalen;
  439. } while(blks!=0);
  440. debug ("scsi_read_ext: end startblk %lx, blccnt %x buffer %lx\n",start,smallblks,buf_addr);
  441. return(blkcnt);
  442. }
  443. /* copy src to dest, skipping leading and trailing blanks
  444. * and null terminate the string
  445. */
  446. void scsi_ident_cpy (unsigned char *dest, unsigned char *src, unsigned int len)
  447. {
  448. int start,end;
  449. start=0;
  450. while(start<len) {
  451. if(src[start]!=' ')
  452. break;
  453. start++;
  454. }
  455. end=len-1;
  456. while(end>start) {
  457. if(src[end]!=' ')
  458. break;
  459. end--;
  460. }
  461. for( ; start<=end; start++) {
  462. *dest++=src[start];
  463. }
  464. *dest='\0';
  465. }
  466. /* Trim trailing blanks, and NUL-terminate string
  467. */
  468. void scsi_trim_trail (unsigned char *str, unsigned int len)
  469. {
  470. unsigned char *p = str + len - 1;
  471. while (len-- > 0) {
  472. *p-- = '\0';
  473. if (*p != ' ') {
  474. return;
  475. }
  476. }
  477. }
  478. /************************************************************************************
  479. * Some setup (fill-in) routines
  480. */
  481. void scsi_setup_test_unit_ready(ccb * pccb)
  482. {
  483. pccb->cmd[0]=SCSI_TST_U_RDY;
  484. pccb->cmd[1]=pccb->lun<<5;
  485. pccb->cmd[2]=0;
  486. pccb->cmd[3]=0;
  487. pccb->cmd[4]=0;
  488. pccb->cmd[5]=0;
  489. pccb->cmdlen=6;
  490. pccb->msgout[0]=SCSI_IDENTIFY; /* NOT USED */
  491. }
  492. void scsi_setup_read_capacity(ccb * pccb)
  493. {
  494. pccb->cmd[0]=SCSI_RD_CAPAC;
  495. pccb->cmd[1]=pccb->lun<<5;
  496. pccb->cmd[2]=0;
  497. pccb->cmd[3]=0;
  498. pccb->cmd[4]=0;
  499. pccb->cmd[5]=0;
  500. pccb->cmd[6]=0;
  501. pccb->cmd[7]=0;
  502. pccb->cmd[8]=0;
  503. pccb->cmd[9]=0;
  504. pccb->cmdlen=10;
  505. pccb->msgout[0]=SCSI_IDENTIFY; /* NOT USED */
  506. }
  507. void scsi_setup_read_ext(ccb * pccb, unsigned long start, unsigned short blocks)
  508. {
  509. pccb->cmd[0]=SCSI_READ10;
  510. pccb->cmd[1]=pccb->lun<<5;
  511. pccb->cmd[2]=((unsigned char) (start>>24))&0xff;
  512. pccb->cmd[3]=((unsigned char) (start>>16))&0xff;
  513. pccb->cmd[4]=((unsigned char) (start>>8))&0xff;
  514. pccb->cmd[5]=((unsigned char) (start))&0xff;
  515. pccb->cmd[6]=0;
  516. pccb->cmd[7]=((unsigned char) (blocks>>8))&0xff;
  517. pccb->cmd[8]=(unsigned char) blocks & 0xff;
  518. pccb->cmd[6]=0;
  519. pccb->cmdlen=10;
  520. pccb->msgout[0]=SCSI_IDENTIFY; /* NOT USED */
  521. debug ("scsi_setup_read_ext: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
  522. pccb->cmd[0],pccb->cmd[1],
  523. pccb->cmd[2],pccb->cmd[3],pccb->cmd[4],pccb->cmd[5],
  524. pccb->cmd[7],pccb->cmd[8]);
  525. }
  526. void scsi_setup_read6(ccb * pccb, unsigned long start, unsigned short blocks)
  527. {
  528. pccb->cmd[0]=SCSI_READ6;
  529. pccb->cmd[1]=pccb->lun<<5 | (((unsigned char)(start>>16))&0x1f);
  530. pccb->cmd[2]=((unsigned char) (start>>8))&0xff;
  531. pccb->cmd[3]=((unsigned char) (start))&0xff;
  532. pccb->cmd[4]=(unsigned char) blocks & 0xff;
  533. pccb->cmd[5]=0;
  534. pccb->cmdlen=6;
  535. pccb->msgout[0]=SCSI_IDENTIFY; /* NOT USED */
  536. debug ("scsi_setup_read6: cmd: %02X %02X startblk %02X%02X blccnt %02X\n",
  537. pccb->cmd[0],pccb->cmd[1],
  538. pccb->cmd[2],pccb->cmd[3],pccb->cmd[4]);
  539. }
  540. void scsi_setup_inquiry(ccb * pccb)
  541. {
  542. pccb->cmd[0]=SCSI_INQUIRY;
  543. pccb->cmd[1]=pccb->lun<<5;
  544. pccb->cmd[2]=0;
  545. pccb->cmd[3]=0;
  546. if(pccb->datalen>255)
  547. pccb->cmd[4]=255;
  548. else
  549. pccb->cmd[4]=(unsigned char)pccb->datalen;
  550. pccb->cmd[5]=0;
  551. pccb->cmdlen=6;
  552. pccb->msgout[0]=SCSI_IDENTIFY; /* NOT USED */
  553. }
  554. U_BOOT_CMD(
  555. scsi, 5, 1, do_scsi,
  556. "SCSI sub-system",
  557. "reset - reset SCSI controller\n"
  558. "scsi info - show available SCSI devices\n"
  559. "scsi scan - (re-)scan SCSI bus\n"
  560. "scsi device [dev] - show or set current device\n"
  561. "scsi part [dev] - print partition table of one or all SCSI devices\n"
  562. "scsi read addr blk# cnt - read `cnt' blocks starting at block `blk#'\n"
  563. " to memory address `addr'"
  564. );
  565. U_BOOT_CMD(
  566. scsiboot, 3, 1, do_scsiboot,
  567. "boot from SCSI device",
  568. "loadAddr dev:part"
  569. );