Hello, I am running Linux on a PC104 board from a compact flash card. Because the physical DMA lines are missing on some of the compact flash carrier cards, I would like to be able to boot with DMA disabled and to enable DMA in a later stage if desired (and supported by hardware).
The problem is that when I set CONFIG_IDEDMA_AUTO to FALSE, I cannot enable DMA anymore with hdparm, not even with hardware that supports DMA. If I set CONFIG_IDEDMA_AUTO to TRUE, I can use hdparm to disable and enable DMA (but of course I get long timeouts with the carrier cards that do not have the physical DMA lines). Q1: Is this how the CONFIG_IDEDMA_AUTO setting is supposed to work in combination with hdparm? Q2: Is there a way to boot with DMA disabled and to enable it later on once the system is up and running? Kernel: 2.4.32 Chipset: CS5530 Any help is highly appreciated! Regards, Whinyan - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
