Hello,
I have a u-boot-with-spl-pbl.bin booting off NAND, and now I would like to create another build of u-boot to be chain-loaded, and I would appreciate some assistance.
I'm using u-boot tag v2018.05, config T1040RDB_NAND_defconfig as base.
Here's what I tried
Scenario 1: Checking the defconfig, I see that CONFIG_SYS_TEXT_BASE=0x30001000, so I went ahead and tried: => tftp 30001000 u-boot.bin => go 30001000 ## Starting application at 0x30001000 ... and it hangs
Scenario 2: Different load address: => tftp 1000000 u-boot.bin => go 1000000 ## Starting application at 0x01000000 ... hang
Scenario 3: I was thinking that maybe I need to bump the load and text address by 8MB so it does not matches the currently running u-boot (which has CONFIG_SYS_TEXT_BASE=0x30001000), so I applied the following patch: --- a/configs/T1040RDB_NAND_defconfig +++ b/configs/T1040RDB_NAND_defconfig -CONFIG_SYS_TEXT_BASE=0x30001000 +CONFIG_SYS_TEXT_BASE=0x30801000
=> tftp 30801000 u-boot.bin => go 30801000 same hang also different address: => tftp 1000000 u-boot.bin => go 1000000 ## Starting application at 0x01000000 ...
Scenario 4: Remove RAMBOOT_PBL from defconfig: -CONFIG_SYS_EXTRA_OPTIONS="RAMBOOT_PBL,SPL_FSL_PBL" +CONFIG_SYS_EXTRA_OPTIONS="SPL_FSL_PBL"
This results in a binary that is more than 3GB (??????)
Scenario 4.1: I noticed that CONFIG_SYS_TEXT_BASE affects the size of binary so I thought I can fix this by placing it near RAM end, 4 GB - 8 MB: -CONFIG_SYS_TEXT_BASE=0x30001000 +CONFIG_SYS_TEXT_BASE=0xFF800000 -CONFIG_SYS_EXTRA_OPTIONS="RAMBOOT_PBL,SPL_FSL_PBL" +CONFIG_SYS_EXTRA_OPTIONS="SPL_FSL_PBL"
but the size of u-boot.bin is ~249 MB
I also went through, doc/README.ramboot-ppc85xx which describes what I need. Looking over ./arch/powerpc/cpu/mpc85xx/start.S, I see that CCSR relocation is happening but I can't tell to which value, which might explain why I get hangs. I'll have to investigate more.
Any ideas are appreciated.
Best regards, Nicolae