On 04/05/21 10:01 pm, Tim Harvey wrote:
On Tue, May 4, 2021 at 9:28 AM Navin Sankar navin@linumiz.com wrote:
On 04/05/21 8:49 pm, Tim Harvey wrote:
On Sat, May 1, 2021 at 2:32 AM Navin Sankar navin@linumiz.com wrote:
Hello all,
Ported uboot to seeed studio based imx6ull board.
NAND Part Number - mt29f4g08abaeawp NAND Size - 512 MBytesBoth the SPL and U-BOOT image boot successfully from SD card.
While with nand flash, SPL boot's fine. But SPL didn't boot the u-boot from nand flash.
=> mtdparts
device nand0 <gpmi-nand>, # parts = 4 #: name size offset mask_flags 0: spl 0x00080000 0x00000000 0 1: uboot 0x00100000 0x00080000 0 2: uboot-dup 0x00100000 0x00180000 0 3: ubi 0x1fd80000 0x00280000 0
active partition: nand0,0 - (spl) 0x00080000 @ 0x00000000
defaults: mtdids : nand0=gpmi-nand mtdparts: gpmi-nand:512k(spl),1m(uboot),1m(uboot-dup),-(ubi)
And I flashed the SPL and u-boot image from SD card.
Here is flashing result,
Initially erased the nand chip
=> nand erase.chip
NAND erase.chip: device 0 whole chip Skipping bad block at 0x1ff00000 Skipping bad block at 0x1ff40000 Skipping bad block at 0x1ff80000 Skipping bad block at 0x1ffc0000
OK
Then flashed the SPL
=> ext4load mmc 0:1 $loadaddr SPL 35840 bytes read in 4 ms (8.5 MiB/s) => nand erase.part spl
NAND erase.part: device 0 offset 0x0, size 0x80000 Erasing at 0x40000 -- 100% complete. OK => nandbcb init $loadaddr 0x0 $filesize device 0 offset 0x0, size 0x8c00 Skipping bad block at 0x1ff00000 Skipping bad block at 0x1ff40000 Skipping bad block at 0x1ff80000 Skipping bad block at 0x1ffc0000
Write firmware0 @0x200000 offset, 0x9000 bytes written: OK Write firmware1 @0x10100000 offset, 0x9000 bytes written: OK NAND FCB write to 0x400 offset 0x0 written: OK NAND FCB write to 0x400 offset 0x40000 written: OK NAND FCB write to 0x400 offset 0x80000 written: OK NAND FCB write to 0x400 offset 0xc0000 written: OK NAND DBBT write to 0x100000 offset 0x1000 written: OK DBBT data write to 0x104000 offset 0x1000 written: OK NAND DBBT write to 0x140000 offset 0x1000 written: OK DBBT data write to 0x144000 offset 0x1000 written: OK NAND DBBT write to 0x180000 offset 0x1000 written: OK DBBT data write to 0x184000 offset 0x1000 written: OK NAND DBBT write to 0x1c0000 offset 0x1000 written: OK DBBT data write to 0x1c4000 offset 0x1000 written: OK
Afterwards flashed the uboot image,
=> ext4load mmc 0:1 $loadaddr u-boot-dtb.img 624580 bytes read in 29 ms (20.5 MiB/s) => nand erase.part uboot
NAND erase.part: device 0 offset 0x80000, size 0x100000 Erasing at 0x140000 -- 100% complete. OK => nand erase.part uboot-dup
NAND erase.part: device 0 offset 0x180000, size 0x100000 Erasing at 0x240000 -- 100% complete. OK => nand write $loadaddr uboot $filesize
NAND write: device 0 offset 0x80000, size 0x987c4 624580 bytes written: OK
Everything work's fine, but it didn't boot the u-boot image from nand storage.
U-Boot SPL 2021.07-rc1-02889-gf6058bbb94-dirty (May 01 2021 - 14:12:55 +0530) Trying to boot from NAND
Any hint?
Navin,
Everything above makes sense but the important thing is what you set CONFIG_SYS_SPL_ARGS_ADDR as that is where the SPL will attempt to load U-Boot from. Check that value and make sure its 0x80000 and if it is correct add some debug prints around the loading of the U-Boot image to make sure everything goes as planned.
Best regards,
Tim
Hi Tim,
Assigned CONFIG_SYS_SPL_ARGS_ADDR to 0x80000 and added some debug prints
SPL loads the uboot the image successfully in RAM (crossed checked by printing the image header and flashed image)
and SPL also reaches the image entry point.
image entry point: 0x87800000
But still the uboot image is not booting.
Navin,
Maybe use hexdump to dump what was loaded to RAM to verify contents and ensure there isn't a raw nand/ECC issue?
Because you say this boots from microSD we can assume your dram setup and everything is good so it must be the content of what's getting loaded to RAM?
Tim
Tim,
yes, the issue is related to nand/ECC.
I checked it by comparing the nand u-boot-dtb.img flashed to nand and file stored in the SD card. Thanks for your inputs.
Regards, Navin Sankar