Hi,
We encountered an overshooting problem on SD /eMMC. This problem is not happened on 4AJ.2.1(Linux Kernel 3.0),but 4AJ.2.5P2. We reference the document swpa221.pdf that can resolve the overshoot on SD,but eMMC not. We've also checked the register SDMMC1_DRx_SPEEDCTRL that document mentions for resolving the overshooting issue,but the setting of register SDMMC1_DRx_SPEEDCTRL of 4AJ.2.5P2 is the same with 4AJ.2.1.
reg |= (OMAP4_SDMMC1_DR0_SPEEDCTRL_MASK |
OMAP4_SDMMC1_DR1_SPEEDCTRL_MASK |
OMAP4_SDMMC1_DR2_SPEEDCTRL_MASK);
Therefore, we guess the work around of overshooting issue is not on this register. We've checked this thread http://e2e.ti.com/support/omap/f/849/t/236945 ,but no response on it. Could TI have any suggestion on this problem?
regards,
Sean