Chetan Nanda wrote: > We have a MIPS-4KEC based SoC and running an older version of U-Boot > (1.1.3) on it. It is working perfectly fine. > Board has 8MB AMD flash and starting address of that flash is 0xBFC00000 > (reset vector for MIPS). > > Problem is that we are not able to access full 8MB of flash. Only > 0xBFC00000 - 0xBFFFFFFF (4MB) is accessible, as it lies in un-mapped, > un-cached region of MIPS. > From 0xC0000000 lies in mapped memory area of MIPS. > > Now my questions are, creating entry in TLBs is sufficient to access > rest of 4MB of flash?
It depends on its physical address. If your flash device is mapped to 0x1FC00000-0x203FFFFF, you'll need to access to the remaining half via TLBs. However, if it's mapped to 0x1F800000-0x1FFFFFFF, no need to set up TLB entries; you can access anywhere in the devices using KSEG1 virtual addresses. > Is their any interface provided in U-boot to update TLB? There's write_one_tlb() prepared in cpu/mips/cpu.c (I don't know whether it works or not, as I've never had a chance to use it so far). Lastly, AFAIK there's no command line interface to do it. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot