Hi Suriyan, On 01/23/2015 10:46 AM, Suriyan Ramasami wrote: > On Thu, Jan 22, 2015 at 9:51 AM, Kevin Hilman <khil...@kernel.org> wrote: >> Suriyan Ramasami <suriya...@gmail.com> writes: >> >>> Hello Kevin, >>> >>> On Wed, Jan 21, 2015 at 4:54 PM, Kevin Hilman <khil...@kernel.org> wrote: >>>> Hi Surijan, >>>> >>>> Suriyan Ramasami <suriya...@gmail.com> writes: >>>> >>>>> Hello Sjoerd Simons, >>>>> A signed BL2 which allows unsigned BL2 chain load is already >>>>> available for experimentation. Refer this link: >>>>> http://forum.odroid.com/viewtopic.php?f=98&t=6147#p58984 >>>>> The suriyan.bl2-hkxu3.1212.5422.zip blob contains a signed BL2 which >>>>> allows the same. >>>>> >>>>> The layout of SD card is as follows: >>>>> >>>>> BL1 (1 to 30) 15K >>>>> BL2 (31 to 62) 16K >>>>> indicator block (63 to 64) 1K >>>>> uboot (65 to 2112) 1M >>>>> tzsw (2113 to 2624) 256K >>>>> unsigned BL2 (2625 to 2656) 16K >>>>> >>>>> A non zero in the first byte of the indicator block instructs the >>>>> signed BL2 to load the unsigned BL2 @ offset 2625. >>>> >>>> I took the binaries from your .zip file above and put them on the SD >>>> card for my odroid-xu3 at the offsets above. I'm using BL1 and TZSW >>>> from the u-boot-hardkernel release[1] and using u-boot-dtb.bin from >>>> my own mainline u-boot build which inclues the odroid-xu3 patches. >>>> >>>> If I leave the indicator block zero'd, everything works fine, and it >>>> boots my version of mainline u-boot without any problems. >>>> >>>> If I then write a non-zero value to the first byte of the indicator >>>> block and write your unsigned BL2 at the appropriate offset, it no >>>> longer boots. Is the unsigned BL2 supposed to boot u-boot at offset 65 >>>> when it's finished as well? >>>> >>> >>> The unsigned SPL from mainline used will be spl/u-boot-spl.bin (raw >>> jump to offset 0 in that file will be pure code without headers) >>
Is it impossible the unsigned BL2(spl/smdk5422-spl.bin) file from hardkernel u-boot with your chaining signed BL2? >> OK. >> >>> Changes are needed in spl_boot.c to make it next load u-boot-dtb.bin. >>> >>> I shall try to list most of the changes here: >>> 1.arch/arm/cpu/armv7/exynos/spl_boot.c: >>> The Odroid-XU3's IROM function pointers does not have any code >>> (AFAICT). I checked the locations that are listed in the array table >>> and found all 0's there. >>> We need to replace function copy_uboot_to_ram() with something >>> similar from HK's file, so that it uses exynos_smc() calls to load the >>> bits from SD card, or we could enable MMC code in SPL (haven't tried >>> it) and use those functions instead. >>> For quick results,I just forced an SD card read. >>> >>> 2. #define CONFIG_SEC_FW_SIZE (15 << 10) /* 15 KB */ >>> somewhere, so that the start offset for U-Boot is calculated correctly. >>> >>> 3. for chain loading we define CONFIG_SPL_TEXT_BASE to be, say >>> 0x63E00000 so that when its executed the static global pointers are >>> accessed correctly - static struct spl_machine_param machine_param in >>> file smdk5420_spl.c. >>> >>> 4. mem_ctrl_init() hangs in while (val != FOUTBPLL); >>> One workaround is to use HKs version of this function which again >>> uses some smc calls. >>> >>> With all these changes, SPL chainloading works. >> >> Do you have a patch against mainline u-boot for all these changes? I'd >> be happy to test. >> > > Give me some time and I shall iron out my notes and get back to > creating a patch for this against mainline U-Boot. > I'm also waiting. Thanks for your try. Thanks. >>>> How are you debugging your SPL images? >>>> >>>> I tried adding CONFIG_SPL_SERIAL_SUPPORT so I could printf from SPL, but >>>> that doesn't compile because it seems that libfdt support is needed. >>>> >>> >>> I didn't enable SERIAL SUPPORT for debugging. I did study the HK SPL >>> code vs mainline SPL code quite a bit and worked from there. >>> I can try to see if there is an easy way to enable serial printfs. >> >> Are there any GPIO LEDs to blink? >> > > It does have some LEDs. > >> Thanks, >> >> Kevin > _______________________________________________ > 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
