Dear Pavel Herrmann,
> This driver uses files as block devices, can be used for testing disk
> operations on sandbox.
> A new command "sata_loop" is introduced to load files in runtime.
The description might use a little bit of caressing here :)
[...]
> + if (os_lseek(fd, start_byte, OS_SEEK_SET) != start_byte)
> + return -1;
Use errno consistently ... so -EINVAL ? Or something else?
> + retval = os_read(fd, buffer, length_byte);
> +
> + return retval / ATA_SECT_SIZE;
> +}
[...]
> + if (!strncmp(argv[1], "load", 4)) {
if (strncmp())
return CMD_USAGE;
one indent less here ;-)
> + dev = simple_strtoul(argv[2], NULL, 10);
> + /*
> + * init_sata() and scan_sata() do their own range
> + * check, however we need to explicitly do it here
> + * as well.
> + */
> + if (range_check(dev)) {
> + printf("File index %d is out of range.\n", dev);
> + return -EINVAL;
> + }
> + free(filenames[dev]);
> + filenames[dev] = strdup(argv[3]);
> + init_sata(dev);
> + scan_sata(dev);
> + /*
> + * Scan the partition table if we succeeded in loading
> + * the new loop file.
> + */
> + if (sata_dev_desc[dev].lba > 0)
> + init_part(&sata_dev_desc[dev]);
> +
> + return 0;
> + }
> + return CMD_RET_USAGE;
> + }
> + return CMD_RET_USAGE;
> +}
> +
> +U_BOOT_CMD(
> + sata_loop, 4, 1, do_loop,
> + "SATA loopback",
> + "info - show info about all loop devices\n"
> + "sata_loop info devnum - show info about loop devnum\n"
> + "sata_loop load devnum file - load file from host FS into loop devnum"
> +);
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