On Thu, Jun 5, 2014 at 12:02 PM, Roger Quadros <rogerq@xxxxxx> wrote: > On 06/04/2014 10:45 PM, Yegor Yefremov wrote: >> On Wed, Jun 4, 2014 at 12:52 PM, Sekhar Nori <nsekhar@xxxxxx> wrote: >>> On Wednesday 04 June 2014 04:00 PM, Yegor Yefremov wrote: >>>> On Wed, Jun 4, 2014 at 12:20 PM, Sekhar Nori <nsekhar@xxxxxx> wrote: >>>>> On Wednesday 04 June 2014 03:11 PM, Yegor Yefremov wrote: >>>>>> On Wed, Jun 4, 2014 at 10:48 AM, Roger Quadros <rogerq@xxxxxx> wrote: >>>>>>> Hi, >>>>>>> >>>>>>> On 06/04/2014 11:25 AM, Yegor Yefremov wrote: >>>>>>>> On Wed, Jun 4, 2014 at 8:40 AM, Sekhar Nori <nsekhar@xxxxxx> wrote: >>>>>>>>> On Tuesday 03 June 2014 04:18 PM, Yegor Yefremov wrote: >>>>>>>>>> On Tue, Jun 3, 2014 at 9:57 AM, Yegor Yefremov >>>>>>>>>> <yegorslists@xxxxxxxxxxxxxx> wrote: >>>>>>>>>>> Kernel: 3.14, 3.15 (I haven't tried another kernels) >>>>>>>>>>> >>>>>>>>>>> As soon as I write something to my NAND flash (via cat image > >>>>>>>>>>> /dev/mtdblockx or ubiupdatevol) and make reboot or press a reset >>>>>>>>>>> button, I see only CCCCC and nothing happens before I make a power >>>>>>>>>>> cycle. Any idea? >>>>>>>>>> >>>>>>>>>> Just forgot to mention, that I was actually booting from MMC (mmc1). >>>>>>>>>> The boot sequence is UART0...XIP...MMC0...NAND. >>>>>>> >>>>>>> Can you try to get XIP out of the boot sequence and see if it works? >>>>>>> Maybe try to boot from mmc directly? >>>>>>> >>>>>>> This would prove that NAND/GPMC driver is leaving some state that doesn't >>>>>>> go well with the bootROM XIP. >>>>>> >>>>>> This configuration is soldered. It won't be easy to change. >>>>> >>>>> Most likely XIP is the issue if sysboot has not changed. >>>>> >>>>> The way ROM works for XIP boot is: >>>>> >>>>> 1) Set chip select 0 base address to 0x0800'0000 >>>>> 2) Read memory at 0x0800'0000 >>>>> 3) If something else other than 0x0 or ~0x0 is found, jump to >>>>> 0x0800'0000 and start executing. >>>>> >>>>> Can you check to see the contents of 0x0800'0000 before and after nand >>>>> write using mtdblock? >>>> >>>> Before writing: >>>> >>>> # devmem 0x08000000 32 >>>> 0xFFFFFFFF >>>> >>>> After writing: >>>> >>>> # devmem 0x08000000 32 >>>> 0xE0E0E0E0 >>> >>> Okay, so this is the cause of failure to boot. I am not sure what >>> operation by NAND driver causes this value to change. Perhaps you could >>> bisect a bit by dumping this address at various points during the write >>> operation? >>> >>> If you have a debugger it will become easy to do this. >> >> The 0x80000000 address seems to be the beginning of NAND region: >> >> ranges = <0 0 0x08000000 0x10000000>; /* CS0: NAND */ >> >> I've taken this example from am335x_evm.dts. I have tried to change >> the mapping to 0x90000000, but kernel still uses 0x80000000, Where in >> the kernel will "ranges" be evaluated? I'm digging thorugh >> arch/arm/mach-omap2/gpmc.c and gpmc-nand.c, but didn't really found >> the place. > > Well it doesn't. It just uses whatever was setup by the bootloader or > randomly allocated by gpmc_cs_request(). > > I'm working on fixing this up. I should be posting v2 of the GPMC refactor > series by this week and you should be able to map the CS region as specified > in the DT. > > Till then, maybe you can pre-configure CS0 in the bootloader to wherever you want > or alternatively call gpmc_cs_remap() after the gpmc_cs_request() in gpmc_nand_init(); I've found the stuff in bootloader and mapped NAND to 0x09000000, but it didn't help. Yegor -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
