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 *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. cmd_usage(cmdtp);
  209. return 1;
  210. }
  211. if (!boot_device) {
  212. puts ("\n** No boot device **\n");
  213. return 1;
  214. }
  215. dev = simple_strtoul(boot_device, &ep, 16);
  216. printf("booting from dev %d\n",dev);
  217. if (scsi_dev_desc[dev].type == DEV_TYPE_UNKNOWN) {
  218. printf ("\n** Device %d not available\n", dev);
  219. return 1;
  220. }
  221. if (*ep) {
  222. if (*ep != ':') {
  223. puts ("\n** Invalid boot device, use `dev[:part]' **\n");
  224. return 1;
  225. }
  226. part = simple_strtoul(++ep, NULL, 16);
  227. }
  228. if (get_partition_info (&scsi_dev_desc[dev], part, &info)) {
  229. printf("error reading partinfo\n");
  230. return 1;
  231. }
  232. if ((strncmp((char *)(info.type), BOOT_PART_TYPE, sizeof(info.type)) != 0) &&
  233. (strncmp((char *)(info.type), BOOT_PART_COMP, sizeof(info.type)) != 0)) {
  234. printf ("\n** Invalid partition type \"%.32s\""
  235. " (expect \"" BOOT_PART_TYPE "\")\n",
  236. info.type);
  237. return 1;
  238. }
  239. printf ("\nLoading from SCSI device %d, partition %d: "
  240. "Name: %.32s Type: %.32s\n",
  241. dev, part, info.name, info.type);
  242. debug ("First Block: %ld, # of blocks: %ld, Block Size: %ld\n",
  243. info.start, info.size, info.blksz);
  244. if (scsi_read (dev, info.start, 1, (ulong *)addr) != 1) {
  245. printf ("** Read error on %d:%d\n", dev, part);
  246. return 1;
  247. }
  248. switch (genimg_get_format ((void *)addr)) {
  249. case IMAGE_FORMAT_LEGACY:
  250. hdr = (image_header_t *)addr;
  251. if (!image_check_hcrc (hdr)) {
  252. puts ("\n** Bad Header Checksum **\n");
  253. return 1;
  254. }
  255. image_print_contents (hdr);
  256. cnt = image_get_image_size (hdr);
  257. break;
  258. #if defined(CONFIG_FIT)
  259. case IMAGE_FORMAT_FIT:
  260. fit_hdr = (const void *)addr;
  261. puts ("Fit image detected...\n");
  262. cnt = fit_get_size (fit_hdr);
  263. break;
  264. #endif
  265. default:
  266. puts ("** Unknown image type\n");
  267. return 1;
  268. }
  269. cnt += info.blksz - 1;
  270. cnt /= info.blksz;
  271. cnt -= 1;
  272. if (scsi_read (dev, info.start+1, cnt,
  273. (ulong *)(addr+info.blksz)) != cnt) {
  274. printf ("** Read error on %d:%d\n", dev, part);
  275. return 1;
  276. }
  277. #if defined(CONFIG_FIT)
  278. /* This cannot be done earlier, we need complete FIT image in RAM first */
  279. if (genimg_get_format ((void *)addr) == IMAGE_FORMAT_FIT) {
  280. if (!fit_check_format (fit_hdr)) {
  281. puts ("** Bad FIT image format\n");
  282. return 1;
  283. }
  284. fit_print_contents (fit_hdr);
  285. }
  286. #endif
  287. /* Loading ok, update default load address */
  288. load_addr = addr;
  289. flush_cache (addr, (cnt+1)*info.blksz);
  290. /* Check if we should attempt an auto-start */
  291. if (((ep = getenv("autostart")) != NULL) && (strcmp(ep,"yes") == 0)) {
  292. char *local_args[2];
  293. extern int do_bootm (cmd_tbl_t *, int, int, char *[]);
  294. local_args[0] = argv[0];
  295. local_args[1] = NULL;
  296. printf ("Automatic boot of image at addr 0x%08lX ...\n", addr);
  297. rcode = do_bootm (cmdtp, 0, 1, local_args);
  298. }
  299. return rcode;
  300. }
  301. /*********************************************************************************
  302. * scsi command intepreter
  303. */
  304. int do_scsi (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
  305. {
  306. switch (argc) {
  307. case 0:
  308. case 1: cmd_usage(cmdtp); return 1;
  309. case 2:
  310. if (strncmp(argv[1],"res",3) == 0) {
  311. printf("\nReset SCSI\n");
  312. scsi_bus_reset();
  313. scsi_scan(1);
  314. return 0;
  315. }
  316. if (strncmp(argv[1],"inf",3) == 0) {
  317. int i;
  318. for (i=0; i<CONFIG_SYS_SCSI_MAX_DEVICE; ++i) {
  319. if(scsi_dev_desc[i].type==DEV_TYPE_UNKNOWN)
  320. continue; /* list only known devices */
  321. printf ("SCSI dev. %d: ", i);
  322. dev_print(&scsi_dev_desc[i]);
  323. }
  324. return 0;
  325. }
  326. if (strncmp(argv[1],"dev",3) == 0) {
  327. if ((scsi_curr_dev < 0) || (scsi_curr_dev >= CONFIG_SYS_SCSI_MAX_DEVICE)) {
  328. printf("\nno SCSI devices available\n");
  329. return 1;
  330. }
  331. printf ("\n Device %d: ", scsi_curr_dev);
  332. dev_print(&scsi_dev_desc[scsi_curr_dev]);
  333. return 0;
  334. }
  335. if (strncmp(argv[1],"scan",4) == 0) {
  336. scsi_scan(1);
  337. return 0;
  338. }
  339. if (strncmp(argv[1],"part",4) == 0) {
  340. int dev, ok;
  341. for (ok=0, dev=0; dev<CONFIG_SYS_SCSI_MAX_DEVICE; ++dev) {
  342. if (scsi_dev_desc[dev].type!=DEV_TYPE_UNKNOWN) {
  343. ok++;
  344. if (dev)
  345. printf("\n");
  346. debug ("print_part of %x\n",dev);
  347. print_part(&scsi_dev_desc[dev]);
  348. }
  349. }
  350. if (!ok)
  351. printf("\nno SCSI devices available\n");
  352. return 1;
  353. }
  354. cmd_usage(cmdtp);
  355. return 1;
  356. case 3:
  357. if (strncmp(argv[1],"dev",3) == 0) {
  358. int dev = (int)simple_strtoul(argv[2], NULL, 10);
  359. printf ("\nSCSI device %d: ", dev);
  360. if (dev >= CONFIG_SYS_SCSI_MAX_DEVICE) {
  361. printf("unknown device\n");
  362. return 1;
  363. }
  364. printf ("\n Device %d: ", dev);
  365. dev_print(&scsi_dev_desc[dev]);
  366. if(scsi_dev_desc[dev].type == DEV_TYPE_UNKNOWN) {
  367. return 1;
  368. }
  369. scsi_curr_dev = dev;
  370. printf("... is now current device\n");
  371. return 0;
  372. }
  373. if (strncmp(argv[1],"part",4) == 0) {
  374. int dev = (int)simple_strtoul(argv[2], NULL, 10);
  375. if(scsi_dev_desc[dev].type != DEV_TYPE_UNKNOWN) {
  376. print_part(&scsi_dev_desc[dev]);
  377. }
  378. else {
  379. printf ("\nSCSI device %d not available\n", dev);
  380. }
  381. return 1;
  382. }
  383. cmd_usage(cmdtp);
  384. return 1;
  385. default:
  386. /* at least 4 args */
  387. if (strcmp(argv[1],"read") == 0) {
  388. ulong addr = simple_strtoul(argv[2], NULL, 16);
  389. ulong blk = simple_strtoul(argv[3], NULL, 16);
  390. ulong cnt = simple_strtoul(argv[4], NULL, 16);
  391. ulong n;
  392. printf ("\nSCSI read: device %d block # %ld, count %ld ... ",
  393. scsi_curr_dev, blk, cnt);
  394. n = scsi_read(scsi_curr_dev, blk, cnt, (ulong *)addr);
  395. printf ("%ld blocks read: %s\n",n,(n==cnt) ? "OK" : "ERROR");
  396. return 0;
  397. }
  398. } /* switch */
  399. cmd_usage(cmdtp);
  400. return 1;
  401. }
  402. /****************************************************************************************
  403. * scsi_read
  404. */
  405. #define SCSI_MAX_READ_BLK 0xFFFF /* almost the maximum amount of the scsi_ext command.. */
  406. ulong scsi_read(int device, ulong blknr, ulong blkcnt, void *buffer)
  407. {
  408. ulong start,blks, buf_addr;
  409. unsigned short smallblks;
  410. ccb* pccb=(ccb *)&tempccb;
  411. device&=0xff;
  412. /* Setup device
  413. */
  414. pccb->target=scsi_dev_desc[device].target;
  415. pccb->lun=scsi_dev_desc[device].lun;
  416. buf_addr=(unsigned long)buffer;
  417. start=blknr;
  418. blks=blkcnt;
  419. debug ("\nscsi_read: dev %d startblk %lx, blccnt %lx buffer %lx\n",device,start,blks,(unsigned long)buffer);
  420. do {
  421. pccb->pdata=(unsigned char *)buf_addr;
  422. if(blks>SCSI_MAX_READ_BLK) {
  423. pccb->datalen=scsi_dev_desc[device].blksz * SCSI_MAX_READ_BLK;
  424. smallblks=SCSI_MAX_READ_BLK;
  425. scsi_setup_read_ext(pccb,start,smallblks);
  426. start+=SCSI_MAX_READ_BLK;
  427. blks-=SCSI_MAX_READ_BLK;
  428. }
  429. else {
  430. pccb->datalen=scsi_dev_desc[device].blksz * blks;
  431. smallblks=(unsigned short) blks;
  432. scsi_setup_read_ext(pccb,start,smallblks);
  433. start+=blks;
  434. blks=0;
  435. }
  436. debug ("scsi_read_ext: startblk %lx, blccnt %x buffer %lx\n",start,smallblks,buf_addr);
  437. if(scsi_exec(pccb)!=TRUE) {
  438. scsi_print_error(pccb);
  439. blkcnt-=blks;
  440. break;
  441. }
  442. buf_addr+=pccb->datalen;
  443. } while(blks!=0);
  444. debug ("scsi_read_ext: end startblk %lx, blccnt %x buffer %lx\n",start,smallblks,buf_addr);
  445. return(blkcnt);
  446. }
  447. /* copy src to dest, skipping leading and trailing blanks
  448. * and null terminate the string
  449. */
  450. void scsi_ident_cpy (unsigned char *dest, unsigned char *src, unsigned int len)
  451. {
  452. int start,end;
  453. start=0;
  454. while(start<len) {
  455. if(src[start]!=' ')
  456. break;
  457. start++;
  458. }
  459. end=len-1;
  460. while(end>start) {
  461. if(src[end]!=' ')
  462. break;
  463. end--;
  464. }
  465. for( ; start<=end; start++) {
  466. *dest++=src[start];
  467. }
  468. *dest='\0';
  469. }
  470. /* Trim trailing blanks, and NUL-terminate string
  471. */
  472. void scsi_trim_trail (unsigned char *str, unsigned int len)
  473. {
  474. unsigned char *p = str + len - 1;
  475. while (len-- > 0) {
  476. *p-- = '\0';
  477. if (*p != ' ') {
  478. return;
  479. }
  480. }
  481. }
  482. /************************************************************************************
  483. * Some setup (fill-in) routines
  484. */
  485. void scsi_setup_test_unit_ready(ccb * pccb)
  486. {
  487. pccb->cmd[0]=SCSI_TST_U_RDY;
  488. pccb->cmd[1]=pccb->lun<<5;
  489. pccb->cmd[2]=0;
  490. pccb->cmd[3]=0;
  491. pccb->cmd[4]=0;
  492. pccb->cmd[5]=0;
  493. pccb->cmdlen=6;
  494. pccb->msgout[0]=SCSI_IDENTIFY; /* NOT USED */
  495. }
  496. void scsi_setup_read_capacity(ccb * pccb)
  497. {
  498. pccb->cmd[0]=SCSI_RD_CAPAC;
  499. pccb->cmd[1]=pccb->lun<<5;
  500. pccb->cmd[2]=0;
  501. pccb->cmd[3]=0;
  502. pccb->cmd[4]=0;
  503. pccb->cmd[5]=0;
  504. pccb->cmd[6]=0;
  505. pccb->cmd[7]=0;
  506. pccb->cmd[8]=0;
  507. pccb->cmd[9]=0;
  508. pccb->cmdlen=10;
  509. pccb->msgout[0]=SCSI_IDENTIFY; /* NOT USED */
  510. }
  511. void scsi_setup_read_ext(ccb * pccb, unsigned long start, unsigned short blocks)
  512. {
  513. pccb->cmd[0]=SCSI_READ10;
  514. pccb->cmd[1]=pccb->lun<<5;
  515. pccb->cmd[2]=((unsigned char) (start>>24))&0xff;
  516. pccb->cmd[3]=((unsigned char) (start>>16))&0xff;
  517. pccb->cmd[4]=((unsigned char) (start>>8))&0xff;
  518. pccb->cmd[5]=((unsigned char) (start))&0xff;
  519. pccb->cmd[6]=0;
  520. pccb->cmd[7]=((unsigned char) (blocks>>8))&0xff;
  521. pccb->cmd[8]=(unsigned char) blocks & 0xff;
  522. pccb->cmd[6]=0;
  523. pccb->cmdlen=10;
  524. pccb->msgout[0]=SCSI_IDENTIFY; /* NOT USED */
  525. debug ("scsi_setup_read_ext: cmd: %02X %02X startblk %02X%02X%02X%02X blccnt %02X%02X\n",
  526. pccb->cmd[0],pccb->cmd[1],
  527. pccb->cmd[2],pccb->cmd[3],pccb->cmd[4],pccb->cmd[5],
  528. pccb->cmd[7],pccb->cmd[8]);
  529. }
  530. void scsi_setup_read6(ccb * pccb, unsigned long start, unsigned short blocks)
  531. {
  532. pccb->cmd[0]=SCSI_READ6;
  533. pccb->cmd[1]=pccb->lun<<5 | (((unsigned char)(start>>16))&0x1f);
  534. pccb->cmd[2]=((unsigned char) (start>>8))&0xff;
  535. pccb->cmd[3]=((unsigned char) (start))&0xff;
  536. pccb->cmd[4]=(unsigned char) blocks & 0xff;
  537. pccb->cmd[5]=0;
  538. pccb->cmdlen=6;
  539. pccb->msgout[0]=SCSI_IDENTIFY; /* NOT USED */
  540. debug ("scsi_setup_read6: cmd: %02X %02X startblk %02X%02X blccnt %02X\n",
  541. pccb->cmd[0],pccb->cmd[1],
  542. pccb->cmd[2],pccb->cmd[3],pccb->cmd[4]);
  543. }
  544. void scsi_setup_inquiry(ccb * pccb)
  545. {
  546. pccb->cmd[0]=SCSI_INQUIRY;
  547. pccb->cmd[1]=pccb->lun<<5;
  548. pccb->cmd[2]=0;
  549. pccb->cmd[3]=0;
  550. if(pccb->datalen>255)
  551. pccb->cmd[4]=255;
  552. else
  553. pccb->cmd[4]=(unsigned char)pccb->datalen;
  554. pccb->cmd[5]=0;
  555. pccb->cmdlen=6;
  556. pccb->msgout[0]=SCSI_IDENTIFY; /* NOT USED */
  557. }
  558. U_BOOT_CMD(
  559. scsi, 5, 1, do_scsi,
  560. "SCSI sub-system",
  561. "reset - reset SCSI controller\n"
  562. "scsi info - show available SCSI devices\n"
  563. "scsi scan - (re-)scan SCSI bus\n"
  564. "scsi device [dev] - show or set current device\n"
  565. "scsi part [dev] - print partition table of one or all SCSI devices\n"
  566. "scsi read addr blk# cnt - read `cnt' blocks starting at block `blk#'\n"
  567. " to memory address `addr'"
  568. );
  569. U_BOOT_CMD(
  570. scsiboot, 3, 1, do_scsiboot,
  571. "boot from SCSI device",
  572. "loadAddr dev:part"
  573. );