PowerPC Local Bus
On Aug 9, 2006, at 7:29 AM, Fredrik Roubert wrote: On Tue 08 Aug 17:03 CEST 2006, Kumar Gala wrote: The reason you haven't seen any code is due to several reasons. One, FPGA/localbus implementations can be very specific and thus reuse is difficult. Two, some of this code tends to end up it boot loaders to setup the UPM (take a look at U-boot for possible UPM config code). OK, so you do all the setup in the boot loader and then the driver just needs to ioremap() the FPGA? That sounds reasonable and explains why I haven't found any kernel source code relating to this ... I just didn't expect the kernel to rely on the boot loader to configure this. Is that the recommended way to to it? I don't think there is any recommendation one way or the other. Its just that the boards that are currently supported in the kernel doing have FGPAs needing UPM config and thus there isn't any code one way or the other. - kumar
PowerPC Local Bus
Hi! I'm about to write drivers for some FPGA's that are connected to the local bus of a PowerQUICC II Pro processor and use the user-programmable machines (UPM's) to transfer data over the bus. What code does already exist for Linux to help me with this? In the stock kernels, I can't even find a structure definition for the registers of the local bus controller, but it seems strange that no-one has written such code before me. Will I really have to write everything from scratch, or what code is there that I don't know about yet? Cheers // Fredrik Roubert -- Visserij 192 | +32 473 344527 / +46 708 776974 BE-9000 Gent | http://www.df.lth.se/~roubert/
PowerPC Local Bus
On Aug 8, 2006, at 8:50 AM, Fredrik Roubert wrote: Hi! I'm about to write drivers for some FPGA's that are connected to the local bus of a PowerQUICC II Pro processor and use the user- programmable machines (UPM's) to transfer data over the bus. What code does already exist for Linux to help me with this? In the stock kernels, I can't even find a structure definition for the registers of the local bus controller, but it seems strange that no-one has written such code before me. Will I really have to write everything from scratch, or what code is there that I don't know about yet? The reason you haven't seen any code is due to several reasons. One, FPGA/localbus implementations can be very specific and thus reuse is difficult. Two, some of this code tends to end up it boot loaders to setup the UPM (take a look at U-boot for possible UPM config code). - kumar
