Alexander, We have managed to get the USB ohci driver to work on the Walnut board. I believe one of the problems was that the 405gp platform did not guarantee cache coherency for pci-dma. This is supposedly fixed by patches ohci-0323*.patch and pcipool patches (you can find on usb-devel mailing list).
That didn't improve things at all. Then I discovered that cache invalidates were happening on addresses not aligned with the 405gp cacheline. This junked some good data, and I fixed it by using kmalloc'ed memory for dma and aligning end addresses manually. I also have a fix for the Pegasus ethernet dongle (other drivers probably have to be patched as well.) The code uses a macro called L1_CACHE_ALIGN: #define L1_CACHE_ALIGN(x) (((x)+(L1_CACHE_BYTES-1))&~(L1_CACHE_BYTES-1)) where L1_CACHE_BYTES is 32 for 405gp. hope this helps! sorry if it's too messy. I'll try to help more if I can. Eli ----- Original Message ----- From: "Alexander Kolesnikov" <[EMAIL PROTECTED]> To: <linuxppc-embedded at lists.linuxppc.org> Sent: Thursday, August 30, 2001 2:19 AM Subject: USB support in the HardHet Linux 2.4.2 on the IBM Walnut > > Hi All, > > We have problems with different USB chips on the Walnut board: > > 1.Using of a OHCI chip causes to kernel crash. This problem is famous but > we really need to know whether does any "on the shelf" solution for the > particular case exist. > > 2.When a UHCI chip is used, the USB device connecting to it causes to the > following error messages: > > usb_control/buk_msg:timeout > usb.c:USB device not accepting new address = XX (error=-110) > > The used USB hubs and devices work properly with another OS on the PC > platform. > > Thanks in advance. > > -------------- next part -------------- A non-text attachment was scrubbed... Name: usb.h.patch Type: application/octet-stream Size: 828 bytes Desc: not available Url : http://ozlabs.org/pipermail/linuxppc-embedded/attachments/20010903/2a7d6020/attachment.obj -------------- next part -------------- A non-text attachment was scrubbed... Name: usb.patch Type: application/octet-stream Size: 7439 bytes Desc: not available Url : http://ozlabs.org/pipermail/linuxppc-embedded/attachments/20010903/2a7d6020/attachment-0001.obj
