CMD55 assumed to be nonexistent for MMC
Information:
Type :: BUG
Status :: CLOSED
Assigned to ::
Arnim, Laeuger
Description:
MMC and SD card are discerned after CMD55. (@ line 529, spi_boot.vhd)
According to SD card Physical Layer Simplified Specification Version 2.00(Downloadable @ sdcard.org), CMD55 is a "prefix" to ACMDs, and the judgement should be made after ACMD41 I think. (Figure 7.2)
Please check it out because the code may not be tested on MMC card.
Comments:
| Laeuger, Arnim | Aug 18, 2007 |
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| Released as part of Version 3.2, rev. C | |
| Laeuger, Arnim | Aug 8, 2007 |
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| Latest CVS version 1.11 of spi_boot.vhd contains a fix for this problem. Please let me know if you still see an issue here. Otherwise I'll release the code and documentation within the next days. | |
| Laeuger, Arnim | Aug 5, 2007 |
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|
Thanks for bringing up this issue.
Do you have an MMC card at hand that shows this problem? It'd be beneficial to have such a card available to test ay future modification. Arnim |
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