Linux kernel: 4.1.15 (imx_4.1.15_1.0.0_ga branch)
I've noticed that writing to the boot partition is overwritten by RPMB related functions as it stores this byte (card->ext_csd.part_conf). It is necessary to update this reference when issuing CMD6 SWITCH through ioctl. See below patch for above kernel version:
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index be776fa..cbd0533 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -60,7 +60,9 @@ MODULE_ALIAS("mmc:block");
#define INAND_CMD38_ARG_SECTRIM2 0x88
#define MMC_BLK_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
#define MMC_SANITIZE_REQ_TIMEOUT 240000
-#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
+#define MMC_EXTRACT_SWITCH_MODE_FROM_ARG(x) (((x) & 0x03000000) >> 24)
+#define MMC_EXTRACT_INDEX_FROM_ARG(x) (((x) & 0x00FF0000) >> 16)
+#define MMC_EXTRACT_VALUE_FROM_ARG(x) (((x) & 0x0000FF00) >> 8)
#define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
(req->cmd_flags & REQ_META)) && \
@@ -572,6 +574,24 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
goto cmd_rel_host;
}
+ /* If writing part config register, update struct */
+ if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
+ (cmd.opcode == MMC_SWITCH)) {
+ u8 mode = MMC_EXTRACT_SWITCH_MODE_FROM_ARG(cmd.arg);
+ u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
+ switch (mode) {
+ case MMC_SWITCH_MODE_SET_BITS:
+ card->ext_csd.part_config |= value;
+ break;
+ case MMC_SWITCH_MODE_CLEAR_BITS:
+ card->ext_csd.part_config &= ~value;
+ break;
+ case MMC_SWITCH_MODE_WRITE_BYTE:
+ card->ext_csd.part_config = value;
+ break;
+ }
+ }
+
/*
* According to the SD specs, some commands require a delay after
* issuing the command.
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