[thirdparty/u-boot.git] / cmd / bcb.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2019 Eugeniu Rosca <rosca.eugeniu@gmail.com>
 *
 * Command to read/modify/write Android BCB fields
 */

#include <android_bootloader_message.h>
#include <command.h>
#include <common.h>
#include <log.h>
#include <part.h>

enum bcb_cmd {
	BCB_CMD_LOAD,
	BCB_CMD_FIELD_SET,
	BCB_CMD_FIELD_CLEAR,
	BCB_CMD_FIELD_TEST,
	BCB_CMD_FIELD_DUMP,
	BCB_CMD_STORE,
};

static int bcb_dev = -1;
static int bcb_part = -1;
static struct bootloader_message bcb = { { 0 } };

static int bcb_cmd_get(char *cmd)
{
	if (!strcmp(cmd, "load"))
		return BCB_CMD_LOAD;
	if (!strcmp(cmd, "set"))
		return BCB_CMD_FIELD_SET;
	if (!strcmp(cmd, "clear"))
		return BCB_CMD_FIELD_CLEAR;
	if (!strcmp(cmd, "test"))
		return BCB_CMD_FIELD_TEST;
	if (!strcmp(cmd, "store"))
		return BCB_CMD_STORE;
	if (!strcmp(cmd, "dump"))
		return BCB_CMD_FIELD_DUMP;
	else
		return -1;
}

static int bcb_is_misused(int argc, char *const argv[])
{
	int cmd = bcb_cmd_get(argv[0]);

	switch (cmd) {
	case BCB_CMD_LOAD:
	case BCB_CMD_FIELD_SET:
		if (argc != 3)
			goto err;
		break;
	case BCB_CMD_FIELD_TEST:
		if (argc != 4)
			goto err;
		break;
	case BCB_CMD_FIELD_CLEAR:
		if (argc != 1 && argc != 2)
			goto err;
		break;
	case BCB_CMD_STORE:
		if (argc != 1)
			goto err;
		break;
	case BCB_CMD_FIELD_DUMP:
		if (argc != 2)
			goto err;
		break;
	default:
		printf("Error: 'bcb %s' not supported\n", argv[0]);
		return -1;
	}

	if (cmd != BCB_CMD_LOAD && (bcb_dev < 0 || bcb_part < 0)) {
		printf("Error: Please, load BCB first!\n");
		return -1;
	}

	return 0;
err:
	printf("Error: Bad usage of 'bcb %s'\n", argv[0]);

	return -1;
}

static int bcb_field_get(char *name, char **fieldp, int *sizep)
{
	if (!strcmp(name, "command")) {
		*fieldp = bcb.command;
		*sizep = sizeof(bcb.command);
	} else if (!strcmp(name, "status")) {
		*fieldp = bcb.status;
		*sizep = sizeof(bcb.status);
	} else if (!strcmp(name, "recovery")) {
		*fieldp = bcb.recovery;
		*sizep = sizeof(bcb.recovery);
	} else if (!strcmp(name, "stage")) {
		*fieldp = bcb.stage;
		*sizep = sizeof(bcb.stage);
	} else if (!strcmp(name, "reserved")) {
		*fieldp = bcb.reserved;
		*sizep = sizeof(bcb.reserved);
	} else {
		printf("Error: Unknown bcb field '%s'\n", name);
		return -1;
	}

	return 0;
}

static int __bcb_load(int devnum, const char *partp)
{
	struct blk_desc *desc;
	struct disk_partition info;
	u64 cnt;
	char *endp;
	int part, ret;

	desc = blk_get_devnum_by_type(IF_TYPE_MMC, devnum);
	if (!desc) {
		ret = -ENODEV;
		goto err_read_fail;
	}

	part = simple_strtoul(partp, &endp, 0);
	if (*endp == '\0') {
		ret = part_get_info(desc, part, &info);
		if (ret)
			goto err_read_fail;
	} else {
		part = part_get_info_by_name(desc, partp, &info);
		if (part < 0) {
			ret = part;
			goto err_read_fail;
		}
	}

	cnt = DIV_ROUND_UP(sizeof(struct bootloader_message), info.blksz);
	if (cnt > info.size)
		goto err_too_small;

	if (blk_dread(desc, info.start, cnt, &bcb) != cnt) {
		ret = -EIO;
		goto err_read_fail;
	}

	bcb_dev = desc->devnum;
	bcb_part = part;
	debug("%s: Loaded from mmc %d:%d\n", __func__, bcb_dev, bcb_part);

	return CMD_RET_SUCCESS;
err_read_fail:
	printf("Error: mmc %d:%s read failed (%d)\n", devnum, partp, ret);
	goto err;
err_too_small:
	printf("Error: mmc %d:%s too small!", devnum, partp);
	goto err;
err:
	bcb_dev = -1;
	bcb_part = -1;

	return CMD_RET_FAILURE;
}

static int do_bcb_load(struct cmd_tbl *cmdtp, int flag, int argc,
		       char * const argv[])
{
	char *endp;
	int devnum = simple_strtoul(argv[1], &endp, 0);

	if (*endp != '\0') {
		printf("Error: Device id '%s' not a number\n", argv[1]);
		return CMD_RET_FAILURE;
	}

	return __bcb_load(devnum, argv[2]);
}

static int __bcb_set(char *fieldp, char *valp)
{
	int size, len;
	char *field, *str, *found;

	if (bcb_field_get(fieldp, &field, &size))
		return CMD_RET_FAILURE;

	len = strlen(valp);
	if (len >= size) {
		printf("Error: sizeof('%s') = %d >= %d = sizeof(bcb.%s)\n",
		       valp, len, size, fieldp);
		return CMD_RET_FAILURE;
	}
	str = valp;

	field[0] = '\0';
	while ((found = strsep(&str, ":"))) {
		if (field[0] != '\0')
			strcat(field, "\n");
		strcat(field, found);
	}

	return CMD_RET_SUCCESS;
}

static int do_bcb_set(struct cmd_tbl *cmdtp, int flag, int argc,
		      char * const argv[])
{
	return __bcb_set(argv[1], argv[2]);
}

static int do_bcb_clear(struct cmd_tbl *cmdtp, int flag, int argc,
			char *const argv[])
{
	int size;
	char *field;

	if (argc == 1) {
		memset(&bcb, 0, sizeof(bcb));
		return CMD_RET_SUCCESS;
	}

	if (bcb_field_get(argv[1], &field, &size))
		return CMD_RET_FAILURE;

	memset(field, 0, size);

	return CMD_RET_SUCCESS;
}

static int do_bcb_test(struct cmd_tbl *cmdtp, int flag, int argc,
		       char *const argv[])
{
	int size;
	char *field;
	char *op = argv[2];

	if (bcb_field_get(argv[1], &field, &size))
		return CMD_RET_FAILURE;

	if (*op == '=' && *(op + 1) == '\0') {
		if (!strncmp(argv[3], field, size))
			return CMD_RET_SUCCESS;
		else
			return CMD_RET_FAILURE;
	} else if (*op == '~' && *(op + 1) == '\0') {
		if (!strstr(field, argv[3]))
			return CMD_RET_FAILURE;
		else
			return CMD_RET_SUCCESS;
	} else {
		printf("Error: Unknown operator '%s'\n", op);
	}

	return CMD_RET_FAILURE;
}

static int do_bcb_dump(struct cmd_tbl *cmdtp, int flag, int argc,
		       char *const argv[])
{
	int size;
	char *field;

	if (bcb_field_get(argv[1], &field, &size))
		return CMD_RET_FAILURE;

	print_buffer((ulong)field - (ulong)&bcb, (void *)field, 1, size, 16);

	return CMD_RET_SUCCESS;
}

static int do_bcb_store(struct cmd_tbl *cmdtp, int flag, int argc,
			char *const argv[])
{
	struct blk_desc *desc;
	struct disk_partition info;
	u64 cnt;
	int ret;

	desc = blk_get_devnum_by_type(IF_TYPE_MMC, bcb_dev);
	if (!desc) {
		ret = -ENODEV;
		goto err;
	}

	ret = part_get_info(desc, bcb_part, &info);
	if (ret)
		goto err;

	cnt = DIV_ROUND_UP(sizeof(struct bootloader_message), info.blksz);

	if (blk_dwrite(desc, info.start, cnt, &bcb) != cnt) {
		ret = -EIO;
		goto err;
	}

	return CMD_RET_SUCCESS;
err:
	printf("Error: mmc %d:%d write failed (%d)\n", bcb_dev, bcb_part, ret);

	return CMD_RET_FAILURE;
}

static struct cmd_tbl cmd_bcb_sub[] = {
	U_BOOT_CMD_MKENT(load, CONFIG_SYS_MAXARGS, 1, do_bcb_load, "", ""),
	U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 1, do_bcb_set, "", ""),
	U_BOOT_CMD_MKENT(clear, CONFIG_SYS_MAXARGS, 1, do_bcb_clear, "", ""),
	U_BOOT_CMD_MKENT(test, CONFIG_SYS_MAXARGS, 1, do_bcb_test, "", ""),
	U_BOOT_CMD_MKENT(dump, CONFIG_SYS_MAXARGS, 1, do_bcb_dump, "", ""),
	U_BOOT_CMD_MKENT(store, CONFIG_SYS_MAXARGS, 1, do_bcb_store, "", ""),
};

static int do_bcb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
	struct cmd_tbl *c;

	if (argc < 2)
		return CMD_RET_USAGE;

	argc--;
	argv++;

	c = find_cmd_tbl(argv[0], cmd_bcb_sub, ARRAY_SIZE(cmd_bcb_sub));
	if (!c)
		return CMD_RET_USAGE;

	if (bcb_is_misused(argc, argv)) {
		/*
		 * We try to improve the user experience by reporting the
		 * root-cause of misusage, so don't return CMD_RET_USAGE,
		 * since the latter prints out the full-blown help text
		 */
		return CMD_RET_FAILURE;
	}

	return c->cmd(cmdtp, flag, argc, argv);
}

U_BOOT_CMD(
	bcb, CONFIG_SYS_MAXARGS, 1, do_bcb,
	"Load/set/clear/test/dump/store Android BCB fields",
	"load  <dev> <part>       - load  BCB from mmc <dev>:<part>\n"
	"bcb set   <field> <val>      - set   BCB <field> to <val>\n"
	"bcb clear [<field>]          - clear BCB <field> or all fields\n"
	"bcb test  <field> <op> <val> - test  BCB <field> against <val>\n"
	"bcb dump  <field>            - dump  BCB <field>\n"
	"bcb store                    - store BCB back to mmc\n"
	"\n"
	"Legend:\n"
	"<dev>   - MMC device index containing the BCB partition\n"
	"<part>  - MMC partition index or name containing the BCB\n"
	"<field> - one of {command,status,recovery,stage,reserved}\n"
	"<op>    - the binary operator used in 'bcb test':\n"
	"          '=' returns true if <val> matches the string stored in <field>\n"
	"          '~' returns true if <val> matches a subset of <field>'s string\n"
	"<val>   - string/text provided as input to bcb {set,test}\n"
	"          NOTE: any ':' character in <val> will be replaced by line feed\n"
	"          during 'bcb set' and used as separator by upper layers\n"
);
Commit	Line	Data
db7b7a05 ER	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Copyright (C) 2019 Eugeniu Rosca <rosca.eugeniu@gmail.com>
	4	*
	5	* Command to read/modify/write Android BCB fields
	6	*/
	7
	8	#include <android_bootloader_message.h>
	9	#include <command.h>
	10	#include <common.h>
f7ae49fc	11	#include <log.h>
e6f6f9e6	12	#include <part.h>
db7b7a05 ER	13
	14	enum bcb_cmd {
	15	BCB_CMD_LOAD,
	16	BCB_CMD_FIELD_SET,
	17	BCB_CMD_FIELD_CLEAR,
	18	BCB_CMD_FIELD_TEST,
	19	BCB_CMD_FIELD_DUMP,
	20	BCB_CMD_STORE,
	21	};
	22
	23	static int bcb_dev = -1;
	24	static int bcb_part = -1;
	25	static struct bootloader_message bcb = { { 0 } };
	26
	27	static int bcb_cmd_get(char *cmd)
	28	{
739168cf	29	if (!strcmp(cmd, "load"))
db7b7a05	30	return BCB_CMD_LOAD;
739168cf	31	if (!strcmp(cmd, "set"))
db7b7a05	32	return BCB_CMD_FIELD_SET;
739168cf	33	if (!strcmp(cmd, "clear"))
db7b7a05	34	return BCB_CMD_FIELD_CLEAR;
739168cf	35	if (!strcmp(cmd, "test"))
db7b7a05	36	return BCB_CMD_FIELD_TEST;
739168cf	37	if (!strcmp(cmd, "store"))
db7b7a05	38	return BCB_CMD_STORE;
739168cf	39	if (!strcmp(cmd, "dump"))
db7b7a05 ER	40	return BCB_CMD_FIELD_DUMP;
	41	else
	42	return -1;
	43	}
	44
	45	static int bcb_is_misused(int argc, char *const argv[])
	46	{
	47	int cmd = bcb_cmd_get(argv[0]);
	48
	49	switch (cmd) {
	50	case BCB_CMD_LOAD:
db7b7a05 ER	51	case BCB_CMD_FIELD_SET:
	52	if (argc != 3)
	53	goto err;
	54	break;
	55	case BCB_CMD_FIELD_TEST:
	56	if (argc != 4)
	57	goto err;
	58	break;
	59	case BCB_CMD_FIELD_CLEAR:
	60	if (argc != 1 && argc != 2)
	61	goto err;
	62	break;
	63	case BCB_CMD_STORE:
	64	if (argc != 1)
	65	goto err;
	66	break;
	67	case BCB_CMD_FIELD_DUMP:
	68	if (argc != 2)
	69	goto err;
	70	break;
	71	default:
	72	printf("Error: 'bcb %s' not supported\n", argv[0]);
	73	return -1;
	74	}
	75
	76	if (cmd != BCB_CMD_LOAD && (bcb_dev < 0 \|\| bcb_part < 0)) {
	77	printf("Error: Please, load BCB first!\n");
	78	return -1;
	79	}
	80
	81	return 0;
	82	err:
	83	printf("Error: Bad usage of 'bcb %s'\n", argv[0]);
	84
	85	return -1;
	86	}
	87
37f1811a	88	static int bcb_field_get(char name, char fieldp, int sizep)
db7b7a05	89	{
739168cf	90	if (!strcmp(name, "command")) {
37f1811a ER	91	*fieldp = bcb.command;
37f1811a ER	92	*sizep = sizeof(bcb.command);
739168cf	93	} else if (!strcmp(name, "status")) {
37f1811a ER	94	*fieldp = bcb.status;
37f1811a ER	95	*sizep = sizeof(bcb.status);
739168cf	96	} else if (!strcmp(name, "recovery")) {
37f1811a ER	97	*fieldp = bcb.recovery;
37f1811a ER	98	*sizep = sizeof(bcb.recovery);
739168cf	99	} else if (!strcmp(name, "stage")) {
37f1811a ER	100	*fieldp = bcb.stage;
37f1811a ER	101	*sizep = sizeof(bcb.stage);
739168cf	102	} else if (!strcmp(name, "reserved")) {
37f1811a ER	103	*fieldp = bcb.reserved;
37f1811a ER	104	*sizep = sizeof(bcb.reserved);
db7b7a05 ER	105	} else {
	106	printf("Error: Unknown bcb field '%s'\n", name);
	107	return -1;
	108	}
	109
	110	return 0;
	111	}
	112
24e85bbd	113	static int __bcb_load(int devnum, const char *partp)
db7b7a05 ER	114	{
db7b7a05 ER	115	struct blk_desc *desc;
0528979f	116	struct disk_partition info;
db7b7a05 ER	117	u64 cnt;
	118	char *endp;
	119	int part, ret;
	120
24e85bbd ER	121	desc = blk_get_devnum_by_type(IF_TYPE_MMC, devnum);
	122	if (!desc) {
	123	ret = -ENODEV;
37f1811a	124	goto err_read_fail;
24e85bbd	125	}
db7b7a05	126
24e85bbd	127	part = simple_strtoul(partp, &endp, 0);
db7b7a05 ER	128	if (*endp == '\0') {
	129	ret = part_get_info(desc, part, &info);
	130	if (ret)
37f1811a	131	goto err_read_fail;
db7b7a05	132	} else {
24e85bbd	133	part = part_get_info_by_name(desc, partp, &info);
db7b7a05 ER	134	if (part < 0) {
db7b7a05 ER	135	ret = part;
37f1811a	136	goto err_read_fail;
db7b7a05 ER	137	}
	138	}
	139
	140	cnt = DIV_ROUND_UP(sizeof(struct bootloader_message), info.blksz);
	141	if (cnt > info.size)
37f1811a	142	goto err_too_small;
db7b7a05 ER	143
	144	if (blk_dread(desc, info.start, cnt, &bcb) != cnt) {
	145	ret = -EIO;
37f1811a	146	goto err_read_fail;
db7b7a05 ER	147	}
	148
	149	bcb_dev = desc->devnum;
	150	bcb_part = part;
	151	debug("%s: Loaded from mmc %d:%d\n", __func__, bcb_dev, bcb_part);
	152
	153	return CMD_RET_SUCCESS;
37f1811a	154	err_read_fail:
24e85bbd	155	printf("Error: mmc %d:%s read failed (%d)\n", devnum, partp, ret);
db7b7a05	156	goto err;
37f1811a	157	err_too_small:
24e85bbd	158	printf("Error: mmc %d:%s too small!", devnum, partp);
db7b7a05 ER	159	goto err;
	160	err:
	161	bcb_dev = -1;
	162	bcb_part = -1;
	163
	164	return CMD_RET_FAILURE;
	165	}
	166
24e85bbd ER	167	static int do_bcb_load(struct cmd_tbl *cmdtp, int flag, int argc,
	168	char * const argv[])
	169	{
	170	char *endp;
	171	int devnum = simple_strtoul(argv[1], &endp, 0);
	172
	173	if (*endp != '\0') {
	174	printf("Error: Device id '%s' not a number\n", argv[1]);
	175	return CMD_RET_FAILURE;
	176	}
	177
	178	return __bcb_load(devnum, argv[2]);
	179	}
	180
02ebe6de	181	static int __bcb_set(char fieldp, char valp)
db7b7a05 ER	182	{
	183	int size, len;
	184	char field, str, *found;
	185
02ebe6de	186	if (bcb_field_get(fieldp, &field, &size))
db7b7a05 ER	187	return CMD_RET_FAILURE;
db7b7a05 ER	188
02ebe6de	189	len = strlen(valp);
db7b7a05 ER	190	if (len >= size) {
db7b7a05 ER	191	printf("Error: sizeof('%s') = %d >= %d = sizeof(bcb.%s)\n",
02ebe6de	192	valp, len, size, fieldp);
db7b7a05 ER	193	return CMD_RET_FAILURE;
db7b7a05 ER	194	}
02ebe6de	195	str = valp;
db7b7a05 ER	196
	197	field[0] = '\0';
	198	while ((found = strsep(&str, ":"))) {
	199	if (field[0] != '\0')
	200	strcat(field, "\n");
	201	strcat(field, found);
	202	}
	203
	204	return CMD_RET_SUCCESS;
	205	}
	206
02ebe6de ER	207	static int do_bcb_set(struct cmd_tbl *cmdtp, int flag, int argc,
	208	char * const argv[])
	209	{
	210	return __bcb_set(argv[1], argv[2]);
	211	}
	212
09140113 SG	213	static int do_bcb_clear(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	214	char *const argv[])
db7b7a05 ER	215	{
	216	int size;
	217	char *field;
	218
	219	if (argc == 1) {
	220	memset(&bcb, 0, sizeof(bcb));
	221	return CMD_RET_SUCCESS;
	222	}
	223
	224	if (bcb_field_get(argv[1], &field, &size))
	225	return CMD_RET_FAILURE;
	226
	227	memset(field, 0, size);
	228
	229	return CMD_RET_SUCCESS;
	230	}
	231
09140113 SG	232	static int do_bcb_test(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	233	char *const argv[])
db7b7a05 ER	234	{
	235	int size;
	236	char *field;
	237	char *op = argv[2];
	238
	239	if (bcb_field_get(argv[1], &field, &size))
	240	return CMD_RET_FAILURE;
	241
	242	if (op == '=' && (op + 1) == '\0') {
	243	if (!strncmp(argv[3], field, size))
	244	return CMD_RET_SUCCESS;
	245	else
	246	return CMD_RET_FAILURE;
	247	} else if (op == '~' && (op + 1) == '\0') {
	248	if (!strstr(field, argv[3]))
	249	return CMD_RET_FAILURE;
	250	else
	251	return CMD_RET_SUCCESS;
	252	} else {
	253	printf("Error: Unknown operator '%s'\n", op);
	254	}
	255
	256	return CMD_RET_FAILURE;
	257	}
	258
09140113 SG	259	static int do_bcb_dump(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	260	char *const argv[])
db7b7a05 ER	261	{
	262	int size;
	263	char *field;
	264
	265	if (bcb_field_get(argv[1], &field, &size))
	266	return CMD_RET_FAILURE;
	267
	268	print_buffer((ulong)field - (ulong)&bcb, (void *)field, 1, size, 16);
	269
	270	return CMD_RET_SUCCESS;
	271	}
	272
09140113 SG	273	static int do_bcb_store(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	274	char *const argv[])
db7b7a05 ER	275	{
db7b7a05 ER	276	struct blk_desc *desc;
0528979f	277	struct disk_partition info;
db7b7a05 ER	278	u64 cnt;
	279	int ret;
	280
	281	desc = blk_get_devnum_by_type(IF_TYPE_MMC, bcb_dev);
	282	if (!desc) {
	283	ret = -ENODEV;
	284	goto err;
	285	}
	286
	287	ret = part_get_info(desc, bcb_part, &info);
	288	if (ret)
	289	goto err;
	290
	291	cnt = DIV_ROUND_UP(sizeof(struct bootloader_message), info.blksz);
	292
	293	if (blk_dwrite(desc, info.start, cnt, &bcb) != cnt) {
	294	ret = -EIO;
	295	goto err;
	296	}
	297
	298	return CMD_RET_SUCCESS;
	299	err:
	300	printf("Error: mmc %d:%d write failed (%d)\n", bcb_dev, bcb_part, ret);
	301
	302	return CMD_RET_FAILURE;
	303	}
	304
09140113	305	static struct cmd_tbl cmd_bcb_sub[] = {
db7b7a05 ER	306	U_BOOT_CMD_MKENT(load, CONFIG_SYS_MAXARGS, 1, do_bcb_load, "", ""),
	307	U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 1, do_bcb_set, "", ""),
	308	U_BOOT_CMD_MKENT(clear, CONFIG_SYS_MAXARGS, 1, do_bcb_clear, "", ""),
	309	U_BOOT_CMD_MKENT(test, CONFIG_SYS_MAXARGS, 1, do_bcb_test, "", ""),
	310	U_BOOT_CMD_MKENT(dump, CONFIG_SYS_MAXARGS, 1, do_bcb_dump, "", ""),
	311	U_BOOT_CMD_MKENT(store, CONFIG_SYS_MAXARGS, 1, do_bcb_store, "", ""),
	312	};
	313
09140113	314	static int do_bcb(struct cmd_tbl cmdtp, int flag, int argc, char const argv[])
db7b7a05	315	{
09140113	316	struct cmd_tbl *c;
db7b7a05 ER	317
	318	if (argc < 2)
	319	return CMD_RET_USAGE;
	320
	321	argc--;
	322	argv++;
	323
	324	c = find_cmd_tbl(argv[0], cmd_bcb_sub, ARRAY_SIZE(cmd_bcb_sub));
	325	if (!c)
	326	return CMD_RET_USAGE;
	327
	328	if (bcb_is_misused(argc, argv)) {
37f1811a ER	329	/*
37f1811a ER	330	* We try to improve the user experience by reporting the
db7b7a05 ER	331	* root-cause of misusage, so don't return CMD_RET_USAGE,
	332	* since the latter prints out the full-blown help text
	333	*/
	334	return CMD_RET_FAILURE;
	335	}
	336
	337	return c->cmd(cmdtp, flag, argc, argv);
	338	}
	339
	340	U_BOOT_CMD(
	341	bcb, CONFIG_SYS_MAXARGS, 1, do_bcb,
	342	"Load/set/clear/test/dump/store Android BCB fields",
	343	"load <dev> <part> - load BCB from mmc <dev>:<part>\n"
	344	"bcb set <field> <val> - set BCB <field> to <val>\n"
	345	"bcb clear [<field>] - clear BCB <field> or all fields\n"
	346	"bcb test <field> <op> <val> - test BCB <field> against <val>\n"
	347	"bcb dump <field> - dump BCB <field>\n"
	348	"bcb store - store BCB back to mmc\n"
	349	"\n"
	350	"Legend:\n"
	351	"<dev> - MMC device index containing the BCB partition\n"
	352	"<part> - MMC partition index or name containing the BCB\n"
	353	"<field> - one of {command,status,recovery,stage,reserved}\n"
	354	"<op> - the binary operator used in 'bcb test':\n"
	355	" '=' returns true if <val> matches the string stored in <field>\n"
	356	" '~' returns true if <val> matches a subset of <field>'s string\n"
	357	"<val> - string/text provided as input to bcb {set,test}\n"
	358	" NOTE: any ':' character in <val> will be replaced by line feed\n"
	359	" during 'bcb set' and used as separator by upper layers\n"
	360	);