This series adds the fields of the CID register found in MMC and SD
cards as parameters to the device. The intention is to use these
parameters in scripting e.g. for safety checks before applying
potentially destructive changes.
During the implementation I found several bugs in the implementation of
the CID parsing that usually stem from not discerning between MMC and
SD cards.
For a proof of work I have attached these outputs of both an internal
eMMC and SD card on an Phyboard Polis imx8mm device. The first output is
mmc-utils and the second barebox at the state of this patch series:
eMMC:
root@phyboard-polis-imx8mm-4:~ mmc cid read /sys/class/block/mmcblk2/device -v
======MMC/CID======
MID: 0x13 (Micron)
CBX: 0x1 (BGA)
OID: 0x4e
PNM: Q2J55L
PRV: 0x10 (1.0)
PSN: 0x13723b3f
MDT: 0x93 2000 oct <-- This is likely a bug in mmc-utils
CRC: 0x00
barebox@PHYTEC phyBOARD-Polis-i.MX8MM RDK: devinfo mmc2
Card information:
<snip>
Manufacturer ID: 0x13
OEM/Application ID: 0x4E
CBX: 1
Product name: 'Q2J55L'
Product revision: 1.0
Serial no: 326253375
Manufacturing date: 2022.3
</snip>
Parameters:
<snip>
cid_cbx: 1 (type: uint32)
cid_mdt: 2022.3 (type: string)
cid_mid: 0x13 (type: uint32)
cid_oid: 0x4E (type: string)
cid_pnm: Q2J55L (type: string)
cid_prv: 1.0 (type: string)
cid_psn: 326253375 (type: uint32)
</snip>
SD card:
root@phyboard-polis-imx8mm-4:~ mmc cid read /sys/class/block/mmcblk1/device -v
======SD/CID======
MID: 0x63 (Unlisted)
OID: C`
PNM: CACTU
PRV: 0x02 (0.2)
PSN: 0x583010d2
MDT: 0x158 2021 sep
CRC: 0x00
barebox@PHYTEC phyBOARD-Polis-i.MX8MM RDK:/ devinfo mmc1
Card information:
<snip>
Manufacturer ID: 0x63
OEM/Application ID: C`
Product name: 'CACTU'
Product revision: 0.2
Serial no: 2139062282
Manufacturing date: 2021.8
</snip>
Parameters:
<snip>
cid_mdt: 2021.8 (type: string)
cid_mid: 0x63 (type: uint32)
cid_oid: C` (type: string)
cid_pnm: CACTU (type: string)
cid_prv: 0.2 (type: string)
cid_psn: 2139062282 (type: uint32)
</snip>
Signed-off-by: Stefan Kerkmann <s.kerkmann@xxxxxxxxxxxxxx>
---
Stefan Kerkmann (9):
mci: core: rename mtd to mdt
mci: core: add cbx extraction function
mci: core: add product name extraction function
mci: core: add manufacturing date extraction function
mci: core: parse cid into parameters
mci: core: fix extract_prv and write to string buffer
mci: core: add CBX field as parameter and print it
mci: core: fix extract_oid and write to string buffer
mci: core: add missing slice range for extract_psn function
drivers/mci/mci-core.c | 119 ++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 98 insertions(+), 21 deletions(-)
---
base-commit: 80d7c9d3d80e75e2335a123d414fd7fe83508291
change-id: 20240528-feature-mmc-cid-as-parameters-685158ffc027
Best regards,
--
Stefan Kerkmann <s.kerkmann@xxxxxxxxxxxxxx>
