/**
* Try to register an environment storage on the attached MCI card
* @return 0 on success
*
* We rely on the existence of a usable SD card, already attached to
* our system, to get something like a persistent memory for our environment.
* If this SD card is also the boot media, we can use the second partition
* for our environment purpose (if present!).
*/
static int register_persistant_environment(void)
{
struct cdev *cdev;
/*
* The imx23-olinuxino only has one MCI card socket.
* So, we expect its name as "disk0".
*/
cdev = cdev_by_name("disk0");
if (cdev == NULL) {
pr_err("No MCI card preset\n");
return -ENODEV;
}
/* MCI card is present, also a useable partition on it? */
cdev = cdev_by_name("disk0.1");
if (cdev == NULL) {
pr_err("No second partition available\n");
pr_info("Please create at least a second partition with"
" 256 kiB...512 kiB in size (your choice)\n");
return -ENODEV;
}
/* use the full partition as our persistent environment storage */
cdev = devfs_add_partition("disk0.1", 0, cdev->size,
DEVFS_PARTITION_FIXED, "env0");
if (IS_ERR(cdev))
return PTR_ERR(cdev);
return 0;
}
static int at91sam9263ek_devices_init(void)
{
/*
* PB27 enables the 50MHz oscillator for Ethernet PHY
* 1 - enable
* 0 - disable
*/
at91_set_gpio_output(AT91_PIN_PB27, 1);
at91_set_gpio_value(AT91_PIN_PB27, 1); /* 1- enable, 0 - disable */
ek_add_device_nand();
at91_add_device_eth(0, &macb_pdata);
add_cfi_flash_device(0, AT91_CHIPSELECT_0, 8 * 1024 * 1024, 0);
ek_add_device_mci();
ek_device_add_leds();
ek_add_device_udc();
ek_add_device_buttons();
if (IS_ENABLED(CONFIG_DRIVER_CFI) && cdev_by_name("nor0")) {
devfs_add_partition("nor0", 0x00000, 0x40000, PARTITION_FIXED, "self");
devfs_add_partition("nor0", 0x40000, 0x20000, PARTITION_FIXED, "env0");
} else if (IS_ENABLED(CONFIG_NAND_ATMEL)) {
devfs_add_partition("nand0", 0x00000, SZ_128K, PARTITION_FIXED, "at91bootstrap_raw");
dev_add_bb_dev("at91bootstrap_raw", "at91bootstrap");
devfs_add_partition("nand0", SZ_128K, SZ_256K, PARTITION_FIXED, "self_raw");
dev_add_bb_dev("self_raw", "self0");
devfs_add_partition("nand0", SZ_256K + SZ_128K, SZ_128K, PARTITION_FIXED, "env_raw");
dev_add_bb_dev("env_raw", "env0");
devfs_add_partition("nand0", SZ_512K, SZ_128K, PARTITION_FIXED, "env_raw1");
dev_add_bb_dev("env_raw1", "env1");
}
armlinux_set_bootparams((void *)(AT91_CHIPSELECT_1 + 0x100));
armlinux_set_architecture(MACH_TYPE_AT91SAM9263EK);
return 0;
}
static int do_nand(struct command *cmdtp, int argc, char *argv[])
{
int opt;
struct nand_bb *bb;
int command = 0, badblock = 0;
while((opt = getopt(argc, argv, "adb:")) > 0) {
if (command) {
printf("only one command may be given\n");
return 1;
}
switch (opt) {
case 'a':
command = NAND_ADD;
break;
case 'd':
command = NAND_DEL;
break;
case 'b':
command = NAND_MARKBAD;
badblock = simple_strtoul(optarg, NULL, 0);
}
}
if (command & NAND_ADD) {
while (optind < argc) {
if (dev_add_bb_dev(argv[optind], NULL))
return 1;
optind++;
}
}
if (command & NAND_DEL) {
while (optind < argc) {
struct cdev *cdev;
cdev = cdev_by_name(basename(argv[optind]));
if (!cdev) {
printf("no such device: %s\n", argv[optind]);
return 1;
}
bb = cdev->priv;
close(bb->fd);
devfs_remove(cdev);
free(bb);
optind++;
}
}
if (command & NAND_MARKBAD) {
if (optind < argc) {
int ret = 0, fd;
printf("marking block at 0x%08x on %s as bad\n", badblock, argv[optind]);
fd = open(argv[optind], O_RDWR);
if (fd < 0) {
perror("open");
return 1;
}
ret = ioctl(fd, MEMSETBADBLOCK, (void *)badblock);
if (ret)
perror("ioctl");
close(fd);
return ret;
}
}
return 0;
}
static int imx_bbu_nand_update(struct bbu_handler *handler, struct bbu_data *data)
{
struct imx_nand_fcb_bbu_handler *imx_handler =
container_of(handler, struct imx_nand_fcb_bbu_handler, handler);
struct cdev *bcb_cdev;
struct mtd_info *mtd;
int ret, i;
struct fcb_block *fcb = NULL;
void *fw = NULL, *fw_orig = NULL;
unsigned fw_size, partition_size;
enum filetype filetype;
unsigned num_blocks_fw;
int pages_per_block;
int used = 0;
int fw_orig_len;
int used_refresh = 0, unused_refresh = 0;
if (data->image) {
filetype = file_detect_type(data->image, data->len);
if (filetype != imx_handler->filetype &&
!bbu_force(data, "Image is not of type %s but of type %s",
file_type_to_string(imx_handler->filetype),
file_type_to_string(filetype)))
return -EINVAL;
}
bcb_cdev = cdev_by_name(handler->devicefile);
if (!bcb_cdev) {
pr_err("%s: No FCB device!\n", __func__);
return -ENODEV;
}
mtd = bcb_cdev->mtd;
partition_size = mtd->size;
pages_per_block = mtd->erasesize / mtd->writesize;
for (i = 0; i < 4; i++) {
read_fcb(mtd, i, &fcb);
if (fcb)
break;
}
/*
* This code uses the following layout in the Nand flash:
*
* fwmaxsize = (n_blocks - 4) / 2
*
* block
*
* 0 ----------------------
* | FCB/DBBT 0 |
* 1 ----------------------
* | FCB/DBBT 1 |
* 2 ----------------------
* | FCB/DBBT 2 |
* 3 ----------------------
* | FCB/DBBT 3 |
* 4 ----------------------
* | Firmware slot 0 |
* 4 + fwmaxsize ----------------------
* | Firmware slot 1 |
* ----------------------
*
* We want a robust update in which a power failure may occur
* everytime without bricking the board, so here's the strategy:
*
* The FCBs contain pointers to the firmware slots in the
* Firmware1_startingPage and Firmware2_startingPage fields. Note that
* Firmware1_startingPage doesn't necessarily point to slot 0. We
* exchange the pointers during update to atomically switch between the
* old and the new firmware.
*
* - We read the first valid FCB and the firmware slots.
* - We check which firmware slot is currently used by the ROM:
* - if no FCB is found or its layout differs from the above layout,
* continue without robust update
* - if only one firmware slot is readable, the ROM uses it
* - if both slots are readable, the ROM will use slot 0
* - Step 1: erase/update the slot currently unused by the ROM
* - Step 2: Update FCBs/DBBTs, thereby letting Firmware1_startingPage
* point to the slot we just updated. From this moment
* on the new firmware will be used and running a
* refresh/repair after a power failure after this
* step will complete the update.
* - Step 3: erase/update the other firmwre slot
* - Step 4: Eventually write FCBs/DBBTs again. This may become
* necessary when step 3 revealed new bad blocks.
*
* This robust update only works when the original FCBs on the device
* uses the same layout as this code does. In other cases update will
* also work, but it won't be robust against power failures.
*
* Refreshing the firmware which is needed when blocks become unreadable
* due to read disturbance works the same way, only that the new firmware
* is the same as the old firmware and that it will only be written when
* reading from the device returns -EUCLEAN indicating that a block needs
* to be rewritten.
*/
if (fcb)
read_firmware_all(mtd, fcb, &fw_orig, &fw_orig_len,
&used_refresh, &unused_refresh, &used);
if (data->image) {
/*
* We have to write one additional page to make the ROM happy.
* Maybe the PagesInFirmwarex fields are really the number of pages - 1.
* kobs-ng has the same.
*/
fw_size = ALIGN(data->len + mtd->writesize, mtd->writesize);
fw = xzalloc(fw_size);
memcpy(fw, data->image, data->len);
free(fw_orig);
used_refresh = 1;
unused_refresh = 1;
free(fcb);
fcb = xzalloc(sizeof(*fcb));
fcb->Firmware1_startingPage = imx_bbu_firmware_start_block(mtd, !used) * pages_per_block;
fcb->Firmware2_startingPage = imx_bbu_firmware_start_block(mtd, used) * pages_per_block;
fcb->PagesInFirmware1 = fw_size / mtd->writesize;
fcb->PagesInFirmware2 = fcb->PagesInFirmware1;
fcb_create(imx_handler, fcb, mtd);
} else {
if (!fcb) {
pr_err("No FCB found on device, cannot refresh\n");
ret = -EINVAL;
goto out;
}
if (!fw_orig) {
pr_err("No firmware found on device, cannot refresh\n");
ret = -EINVAL;
goto out;
}
fw = fw_orig;
fw_size = fw_orig_len;
pr_info("Refreshing existing firmware\n");
}
num_blocks_fw = imx_bbu_firmware_max_blocks(mtd);
if (num_blocks_fw * mtd->erasesize < fw_size) {
pr_err("Not enough space for update\n");
return -ENOSPC;
}
ret = bbu_confirm(data);
if (ret)
goto out;
/* Step 1: write firmware which is currently unused by the ROM */
if (unused_refresh) {
pr_info("%sing slot %d\n", data->image ? "updat" : "refresh", !used);
ret = imx_bbu_write_firmware(mtd, !used, fw, fw_size);
if (ret < 0)
goto out;
} else {
pr_info("firmware slot %d still ok, nothing to do\n", !used);
}
/*
* Step 2: Write FCBs/DBBTs. This will use the firmware we have
* just written as primary firmware. From now on the new
* firmware will be booted.
*/
ret = imx_bbu_write_fcbs_dbbts(mtd, fcb);
if (ret < 0)
goto out;
/* Step 3: Write the secondary firmware */
if (used_refresh) {
pr_info("%sing slot %d\n", data->image ? "updat" : "refresh", used);
ret = imx_bbu_write_firmware(mtd, used, fw, fw_size);
if (ret < 0)
goto out;
} else {
pr_info("firmware slot %d still ok, nothing to do\n", used);
}
/*
* Step 4: If writing the secondary firmware discovered new bad
* blocks, write the FCBs/DBBTs again with updated bad block
* information.
*/
if (ret > 0) {
pr_info("New bad blocks detected, writing FCBs/DBBTs again\n");
ret = imx_bbu_write_fcbs_dbbts(mtd, fcb);
if (ret < 0)
goto out;
}
out:
free(fw);
free(fcb);
return ret;
}
