According to eMMC Protocol Specification JESD84-B51 Section 7.5 ``` The writable 16-bit relative Device address (RCA) register carries the Device address assigned by the host during the Device identification. This address is used for the addressed host-Device communication after the Device identification procedure. The default value of the RCA register is 0x0001. The value 0x0000 is reserved to set all Devices into the Stand-by State with CMD7. ``` So definetely 0 does not seem to be a good value. Second, the specification says in A.6 High-speed e•MMC bus functions / A.6.1 Bus initialization: ``` 17. Send CMD3 with a chosen RCA, with value greater than 1 ``` And third, I used a VIP (Verification IP) and plugged it to a simulated host controller chip running Barebox and it said: ``` MGC_EMMC: EMMC_SET_RELATIVE_ADDR_INCORR:152 - Set relative addr should be greater than 1. address given is = 16'h0001 Refer to the eMMC Protocol Specification JESD84-B51 Section 7.5 ``` Note that with an RCA value of 0 or 1, the VIP would print the same error message. Set RCA to 2 instead of 0 for eMMC/MMC case. Signed-off-by: Yann Sionneau <ysionneau@xxxxxxxxxxxxx> --- drivers/mci/mci-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c index 6d0d647377..b9a8580927 100644 --- a/drivers/mci/mci-core.c +++ b/drivers/mci/mci-core.c @@ -450,7 +450,7 @@ static int mmc_send_op_cond(struct mci *mci) mci->ocr = cmd.response[0]; mci->high_capacity = ((mci->ocr & OCR_HCS) == OCR_HCS); - mci->rca = 0; + mci->rca = 2; return 0; } -- 2.42.0
