[FAQ] J722SXH01EVM: PDK 10.0:Bugs in EMMC SBL driver

Hi Gokul,

BUG1:

• The mmcsd_check_transfer_ready function calls  are causing issues when trying to switch from hs2000 to hs mode,when it is called in the MMCSD_v2.c file for j721s2 board.
• Here the mmcsd_check_transfer_ready function is called inside the MMCSD_switch_eMMC_mode function where it is trying to switch speed modes.

FIX:

• The proper implementation would be instead include a delay ,which was done in the 9.0 PDK,which I am attaching below:

• Similar patches are added in Uboot and linux kernel code as well,which I am attaching below:
• UBOOT : https://lists.denx.de/pipermail/u-boot/2019-February/357841.html
• LINUX KERNEL: https://patchwork.kernel.org/project/linux-mmc/patch/1463647662-27426-3-git-send-email-chaotian.jing@mediatek.com/

BUG2:

• The extCid variable is a double pointer integer variable which points to the address of an integer variable which causes issues as other variables is getting overwritten due to this.

Fix:

• The fix would be to define another single pointer and then assign the address of this single pointer to the double pointer.

Regards

Gokul