SPRZ450B February 2018 – September 2024 DRA74P , DRA75P , DRA76P , DRA77P
MMCHS HS200 and SDR104 Command Timeout Window Too Small
Medium
Under high speed HS200 and SDR104 modes, the functional clock for MMC modules will reach up to 192 MHz. At this frequency, the maximum obtainable timeout through of MMC host controller using MMCHS_SYSCTL[19:16] DTO = 0xE is (1/192MHz)*2^27 = 700ms. Commands taking longer than 700ms may be affected by this small window frame.
If the command requires a timeout longer than 700ms, then the MMC host controller command timeout can be disabled (MMCHS_CON[6]MIT=0x1) and a software implementation may be used in its place. Detailed steps as follows (in Linux?):
SR 1.0
AM574x: 1.0
DRA75xP, DRA74xP, DRA77xP, DRA76xP: 1.0
TDA2Px: 1.0
AM576x: 1.0