[U-Boot] [PATCH v4 5/5] usb/gadget: fastboot: implement sparse format

Steve Rae
2014-08-06T23:55:13Z

- add capability to "fastboot flash" with sparse format images

Signed-off-by: Steve Rae <srae@broadcom.com>
---
I suspect that the "sparse image" handling (ie. the "while (remaining_chunks)" loop)
has been implemented elsewhere -- I need help finding the original code to determine
any licensing issues....
Thanks, Steve

Changes in v4:
- rearranged "sparse format" support in this patchset, in order to isolate...

Changes in v3: None
Changes in v2: None

common/fb_mmc.c | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 112 insertions(+), 3 deletions(-)

diff --git a/common/fb_mmc.c b/common/fb_mmc.c
index f42a115..306c102 100644
--- a/common/fb_mmc.c
+++ b/common/fb_mmc.c
@@ -1,5 +1,6 @@
/*
- * Copyright 2014 Broadcom Corporation.
+ * Copyright TODO
+ * Portions Copyright 2014 Broadcom Corporation.
*
* SPDX-License-Identifier: GPL-2.0+
*/
@@ -7,6 +8,7 @@
#include <common.h>
#include <fb_mmc.h>
#include <part.h>
+#include <sparse_format.h>

/* The 64 defined bytes plus \0 */
#define RESPONSE_LEN (64 + 1)
@@ -19,6 +21,108 @@ static void fastboot_resp(const char *s)
response_str[RESPONSE_LEN - 1] = '\0';
}

+static int is_sparse_image(void *buf)
+{
+ sparse_header_t *s_header = (sparse_header_t *)buf;
+
+ if ((le32_to_cpu(s_header->magic) == SPARSE_HEADER_MAGIC) &&
+ (le16_to_cpu(s_header->major_version) == 1))
+ return 1;
+
+ return 0;
+}
+
+static void write_sparse_image(block_dev_desc_t *dev_desc,
+ disk_partition_t *info, const char *part_name,
+ void *buffer, unsigned int download_bytes)
+{
+ lbaint_t blk;
+ lbaint_t blkcnt;
+ lbaint_t blks;
+ sparse_header_t *s_header = (sparse_header_t *)buffer;
+ chunk_header_t *c_header;
+ void *buf;
+ uint32_t blk_sz;
+ uint32_t remaining_chunks;
+ uint32_t bytes_written = 0;
+
+ blk_sz = le32_to_cpu(s_header->blk_sz);
+
+ /* verify s_header->blk_sz is exact multiple of info->blksz */
+ if (blk_sz != (blk_sz & ~(info->blksz - 1))) {
+ printf("%s: Sparse image block size issue [%u]\n",
+ __func__, blk_sz);
+ fastboot_resp("FAILsparse image block size issue");
+ return;
+ }
+
+ if ((le32_to_cpu(s_header->total_blks) * blk_sz) >
+ (info->size * info->blksz)) {
+ printf("%s: Sparse image is too large for the partition\n",
+ __func__);
+ fastboot_resp("FAILsparse image is too large");
+ return;
+ }
+
+ puts("Flashing Sparse Image\n");
+
+ remaining_chunks = le32_to_cpu(s_header->total_chunks);
+ c_header = (chunk_header_t *)(buffer +
+ le16_to_cpu(s_header->file_hdr_sz));
+ blk = info->start;
+ while (remaining_chunks) {
+ blkcnt =
+ (le32_to_cpu(c_header->chunk_sz) * blk_sz) / info->blksz;
+
+ switch (le16_to_cpu(c_header->chunk_type)) {
+ case CHUNK_TYPE_RAW:
+ buf = (void *)c_header +
+ le16_to_cpu(s_header->chunk_hdr_sz);
+
+ if (blk + blkcnt > info->start + info->size) {
+ printf(
+ "%s: Request would exceed partition size!\n",
+ __func__);
+ fastboot_resp(
+ "FAILRequest would exceed partition size!");
+ return;
+ }
+
+ blks = dev_desc->block_write(dev_desc->dev, blk, blkcnt,
+ buf);
+ if (blks != blkcnt) {
+ printf("%s: Write failed " LBAFU "\n",
+ __func__, blks);
+ fastboot_resp("FAILwrite failure");
+ return;
+ }
+
+ bytes_written += blkcnt * info->blksz;
+ break;
+
+ case CHUNK_TYPE_FILL:
+ case CHUNK_TYPE_DONT_CARE:
+ case CHUNK_TYPE_CRC32:
+ /* do nothing */
+ break;
+
+ default:
+ /* error */
+ printf("%s: Unknown chunk type\n", __func__);
+ fastboot_resp("FAILunknown chunk type in sparse image");
+ return;
+ }
+
+ blk += blkcnt;
+ c_header = (chunk_header_t *)((void *)c_header +
+ le32_to_cpu(c_header->total_sz));
+ remaining_chunks--;
+ }
+
+ printf("........ wrote %u bytes to '%s'\n", bytes_written, part_name);
+ fastboot_resp("OKAY");
+}
+
static void write_raw_image(block_dev_desc_t *dev_desc, disk_partition_t *info,
const char *part_name, void *buffer,
unsigned int download_bytes)
@@ -77,6 +181,11 @@ void fb_mmc_flash_write(const char *cmd, void *download_buffer,
return;
}

- write_raw_image(dev_desc, &info, cmd, download_buffer,
- download_bytes);
+ if (is_sparse_image(download_buffer)) {
+ write_sparse_image(dev_desc, &info, cmd, download_buffer,
+ download_bytes);
+ } else {
+ write_raw_image(dev_desc, &info, cmd, download_buffer,
+ download_bytes);
+ }
}
--
1.8.5