I just found something interesting - In my previous email I thought the CFI detection was running from DRAM, but that assumption seems to be wrong. Previously I though it was running from DRAM because I traced the execution using BDI into mips/start">cpu/mips/start.S relocate_code, it runs to the place where it relocates itself. To be exact, here -
addi t0, s2, in_ram - start jr t0 nop I checked and found the pc register changed to pointing to a SDRAM location, so relocation seems to be fine. I also load the symbol-file to the DRAM location at that point. But afterwards if I set breakpoint to board_init_r, the breakpoint is not triggered. Then I realized if I keep using the same symbol-file, the breakpoint at board_init_r can be triggered, and at that point, I can see the PC is still pointing to the flash. I don't understand how can the code, which has been relocated to SDRAM at one point, suddenly going back to run in the flash when it calls board_init_r. Can someone help me? Thanks. On Thu, 01 Oct 2009 16:47 -0500, w...@fastmail.fm wrote: > I have a working u-boot 2008.10 on a mips 32 board and am trying to port > it over to u-boot 2009.06. > So I used buildroot 2009.08 to build the tool chain for my mips32 board > as well as u-boot2009.06. I also copied the previous u-boot > initialization code to > initialize timer, serial port, ram and etc from u-boot 2008.10 to > 2009.06. > > Right now the problem is the new u-boot 2009.06 does not detect cfi of > the flash. I am pretty sure u-boot is running from SDRAM when the > problem happens because the address is in the range of SDRAM. Please let > me know if you have any suggestion - I am running out of ideas. I am > attaching the printout from both the working u-boot 2008.10 and u-boot > 2009.06 below. > > Thanks a lot. > > U-Boot 2009.06 (Sep 30 2009 - 18:41:26) > > Reset Cause: Hardware Reset > DRAM: 64 MB > Top of RAM usable for U-Boot at: 98000000 > Reserving 139k for U-Boot at: 97fdc000 > Reserving 4352k for malloc() at: 97b9c000 > Reserving 36 Bytes for Board Info at: 97b9bfdc > Reserving 36 Bytes for Global Data at: 97b9bfb8 > Reserving 128k for boot params() at: 97b7bfb8 > Stack Pointer at: 97b7bf98 > Now running in RAM - U-Boot at: 97fdc000 > flash detect cfi > not found > flash detect cfi > not found > > > U-Boot 2008.10 (Sep 30 2009 - 11:37:03) > > Reset Cause: Hardware Reset > DRAM: 64 MB > Top of RAM usable for U-Boot at: 98000000 > Reserving 736k for U-Boot at: 97f44000 > Reserving 4352k for malloc() at: 97b04000 > Reserving 44 Bytes for Board Info at: 97b03fd4 > Reserving 36 Bytes for Global Data at: 97b03fb0 > Reserving 128k for boot params() at: 97ae3fb0 > Stack Pointer at: 97ae3f98 > Now running in RAM - U-Boot at: 97f44000 > flash detect cfi > fwc addr b0000000 cmd f0 f0 8bit x 8 bit > fwc addr b0000000 cmd ff ff 8bit x 8 bit > fwc addr b0000055 cmd 98 98 8bit x 8 bit > is= cmd 51(Q) addr b0000010 is= 4f 51 > fwc addr b0000555 cmd 98 98 8bit x 8 bit > is= cmd 51(Q) addr b0000010 is= 4f 51 > fwc addr b0000000 cmd f0 f0f0 16bit x 8 bit > fwc addr b0000000 cmd ff ffff 16bit x 8 bit > fwc addr b00000aa cmd 98 9898 16bit x 8 bit > is= cmd 51(Q) addr b0000020 is= 5151 5151 > is= cmd 52(R) addr b0000022 is= 5252 5252 > is= cmd 59(Y) addr b0000024 is= 5959 5959 > device interface is 2 > found port 2 chip 1 port 16 bits chip 8 bits > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > http://lists.denx.de/mailman/listinfo/u-boot _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
