I am doing a BSP for our custom mpc8308 based board. u-boot is loaded from 1MB NOR, kernel and rootfs are on SD-Card.
Evaluation is done on mpc8308rdb.
I realised that sdhci is not supported in mpc8308rdb devicetree.
I added it myself, finding that it does not work in DMA mode but does work in PIO mode (which is way too slow for productive usage).
Is there something wrong with sdhci and DMA on mpc8308? I did not find any errata on that topic.