From b5f403936d037e0bc08e78b8af64adf53da13b90 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Tue, 31 Oct 2023 13:20:17 +0100 Subject: cmd: mmc: Add mmc reg read command for reading card registers Add extension to the 'mmc' command to read out the card registers. Currently, only the eMMC OCR/CID/CSD/EXTCSD/RCA/DSR register are supported. A register value can either be displayed or read into an environment variable. Tested-by: Jaehoon Chung Reviewed-by: Jaehoon Chung Signed-off-by: Marek Vasut Reviewed-by: Fabio Estevam --- doc/usage/cmd/mmc.rst | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'doc/usage/cmd') diff --git a/doc/usage/cmd/mmc.rst b/doc/usage/cmd/mmc.rst index 71a0303109c..c0924ba5769 100644 --- a/doc/usage/cmd/mmc.rst +++ b/doc/usage/cmd/mmc.rst @@ -21,6 +21,7 @@ Synopsis mmc bootpart-resize mmc partconf [[varname] | [ ]] mmc rst-function + mmc reg read [env] Description ----------- @@ -183,6 +184,31 @@ The 'mmc rst-function' command changes the RST_n_FUNCTION field. 0x3 Reserved +The 'mmc reg read [env]' reads eMMC card register and +either print it to standard output, or store the value in environment +variable. + + with +optional offset into the register array, and print it to +standard output or store it into environment variable [env]. + + reg + cid + The Device IDentification (CID) register. Uses offset. + csd + The Device-Specific Data (CSD) register. Uses offset. + dsr + The driver stage register (DSR). + ocr + The operation conditions register (OCR). + rca + The relative Device address (RCA) register. + extcsd + The Extended CSD register. Uses offset. + offset + For 'cid'/'csd' 128 bit registers '[0..3]' in 32-bit increments. For 'extcsd' 512 bit register '[0..512,all]' in 8-bit increments, or 'all' to read the entire register. + env + Optional environment variable into which 32-bit value read from register should be stored. Examples -------- -- cgit v1.3.1