Hi Scott,
On 12/10/2012 09:24:32 AM, Pantelis Antoniou wrote:
Introduce on-the fly DFU NAND support.
Signed-off-by: Pantelis Antoniou panto@antoniou-consulting.com
drivers/dfu/Makefile | 1 + drivers/dfu/dfu.c | 7 ++ drivers/dfu/dfu_nand.c | 194 +++++++++++++++++++++++++++++++++++++++++++++++++ include/dfu.h | 23 ++++++ 4 files changed, 225 insertions(+) create mode 100644 drivers/dfu/dfu_nand.c
What is DFU? I don't see anything in README or doc/, despite there already being CONFIG symbols for it.
DFU means Device Firmware Upgrade. It is a relatively simple protocol to update firmware on the target (mainly with small files - e.g. uImage).
For more information please skim: http://www.usb.org/developers/devclass_docs/usbdfu10.pdf
+static int nand_block_op(enum dfu_nand_op op, struct dfu_entity *dfu,
u64 offset, void *buf, long *len)+{
- char cmd_buf[DFU_CMD_BUF_SIZE];
- u64 start, count;
- int ret;
- int dev;
- loff_t actual;
- /* if buf == NULL return total size of the area */
- if (buf == NULL) {
*len = dfu->data.nand.size;return 0;- }
- start = dfu->data.nand.start + offset + dfu->bad_skip;
- count = *len;
- if (start + count >
dfu->data.nand.start +dfu->data.nand.size) {
printf("%s: block_op out of bounds\n", __func__);return -1;- }
- dev = nand_curr_device;
- if (dev < 0 || dev >= CONFIG_SYS_MAX_NAND_DEVICE ||
!nand_info[dev].name) {printf("%s: invalid nand device\n", __func__);return -1;- }
- sprintf(cmd_buf, "nand %s %p %llx %llx",
op == DFU_OP_READ ? "read" : "write",buf, start, count);- debug("%s: %s 0x%p\n", __func__, cmd_buf, cmd_buf);
- ret = run_command(cmd_buf, 0);
Why not use the C interface to NAND?
We also support there eMMC (both with raw and file systems). Moreover we had this discussion some time ago (if we shall use "command" or native C API).
- /* find out how much actual bytes have been written */
- /* the difference is the amount of skip we must add from
now on */
- actual = nand_extent_skip_bad(&nand_info[dev], start,
count);
...especially since you already need to interact with it here?
-Scott