diff options
Diffstat (limited to 'spi.c')
-rw-r--r-- | spi.c | 14 |
1 files changed, 13 insertions, 1 deletions
@@ -99,7 +99,19 @@ int default_spi_write_256(struct flashctx *flash, const uint8_t *buf, unsigned i int spi_chip_read(struct flashctx *flash, uint8_t *buf, unsigned int start, unsigned int len) { - return flash->mst->spi.read(flash, buf, start, len); + int ret; + size_t to_read; + for (; len; len -= to_read, buf += to_read, start += to_read) { + /* Do not cross 16MiB boundaries in a single transfer. + This helps with + o multi-die 4-byte-addressing chips, + o dediprog that has a protocol limit of 32MiB-512B. */ + to_read = min(ALIGN_DOWN(start + 16*MiB, 16*MiB) - start, len); + ret = flash->mst->spi.read(flash, buf, start, to_read); + if (ret) + return ret; + } + return 0; } /* |