On Wed, Nov 29, 2023 at 09:29:56AM +0100, Yann Sionneau wrote: > 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(-) Applied, thanks Sascha > > 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 > > > > > > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
