SPRZ487F May   2022  – December 2024 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM625SIP

 

  1.   1
  2. 1Usage Notes and Advisories Matrices
    1. 1.1 Devices Supported
  3. 2Silicon Usage Notes and Advisories
    1. 2.1 Silicon Usage Notes
      1.      i2351
      2.      i2372
      3.      i2424
    2. 2.2 Silicon Advisories
      1.      i2049
      2.      i2062
      3.      i2097
      4.      i2103
      5.      i2134
      6.      i2189
      7.      i2196
      8.      i2232
      9.      i2244
      10.      i2310
      11.      i2311
      12.      i2327
      13.      i2328
      14.      i2279
      15.      i2307
      16.      i2320
      17.      i2329
      18.      i2208
      19.      i2249
      20.      i2278
      21.      i2312
      22.      i2366
      23.      i2371
      24.      i2253
      25.      i2283
      26.      i2383
      27.      i2401
      28.      i2407
      29.      i2409
      30.      i2410
      31.      i2413
      32.      i2414
      33.      i2415
      34.      i2416
      35.      i2417
      36.      i2418
      37.      i2419
      38.      i2420
      39.      i2421
      40.      i2422
      41.      i2423
      42.      i2435
      43.      i2431
  4.   Trademarks
  5.   Revision History

i2312

MMCSD: HS200 and SDR104 Command Timeout Window Too Small

Details:

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 MMCSD_SYSCTL[19:16] DTO = 0xE is (1/192MHz)*2^27 = 700ms. Commands taking longer than 700ms may be affected by this small window frame.

Workaround(s):

If the command requires a timeout longer than 700ms, then the MMC host controller command timeout can be disabled (MMCSD_CON[6] MIT=0x1) and a software implementation may be used in its place. Detailed steps as follows (in Linux):

1. During MMC host controller probe function (omap_hsmmc.c:omap_hsmmc_probe()), inform processor that the host controller is incapable of supporting all the necessary timeouts.

2. Modify the MMC core software layer functionality so the core times out on its own when the underlying MMC host controller is unable to support the required timeout.