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<Net147>
I am getting "failed to set mode: Function not implemented" when trying to use modeset on A20 to test HDMI output with Linux 6.12.38. any ideas?
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<Net147>
*modetest
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<wens>
you might have to enable more debug messages to figure out what function isn't implemented?
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<dlan>
apritzel: jump from FEL to SPL(uboot-spl), how does the core switch from arm32 to aarch64? just found all instructions in FEL were compiled as armv5te, while u-boot-spl as aarch64..
<apritzel>
yes, since FEL is a BootROM routine, and the BROM is fully v7 still, we have to issue AArch32 instructions for everything FEL related. The switch to AArch64 is done at the very end, in fel.c:aw_rmr_request()
<apritzel>
so you write the start address into the RVBAR (reset vector base address register) MMIO registers, then write the RMR (reset management register) system register to trigger a core-only warmboot
<apritzel>
bit 0 of the RMR register tells the core whether to reset in AArch64 or AArch32
<dlan>
ok, that's magic.. I will take a look at it - having problem that first SPL instruction fail to run.. on a733
<apritzel>
mainline U-Boot's SPL has the same code, so if you enter the SPL in AArch32, it will switch to AArch64. It's in arch/arm/include/asm/arch-sunxi/boot0.h
<apritzel>
for FEL booting we must enter the SPL in AArch32, so that the FEL state can be saved. Then we switch to AArch64 to execute the actual SPL code
<apritzel>
at the end we switch back to AArch32, to continue executing the FEL routines in BootROM. Then sunxi-fel does the switch to AArch64 again, to run TF-A
<apritzel>
it's all a bit convoluted, thank Allwinner for sticking to an AArch32 BootROM ...
<apritzel>
dlan: so are you working on upstream patches for the A733 / Cubie A7A?
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<dlan>
apritzel: I'm only taking a look at uboot for now, not 100% for sure will upstream them, but want to get it work first (in the worst case, I'd happy someone could continue from my work..)
<dlan>
thanks for the arch/arm/include/asm/arch-sunxi/boot0.h note, I think I've got a broken SPL while I'm doing the initial port..
<apritzel>
dlan: ok, just wanted to check, for coordination purposes. I am about to finish up the Linux pinctrl driver now, and would start the clocks afterwards
<apritzel>
which is all writing code by looking at other code or the manual atm. Without having a nicely accessible board there is not much testing I can do ...
<dlan>
you don't have A733 board for now?
<apritzel>
I have a tablet only, with secure boot enabled (so extra churn), and no UART except via the SD card pins. I can do some work on it, but it's painful
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<dlan>
apritzel: how do you inspect to get value of rvbar_reg? or CONFIG_SUNXI_RVBAR_ADDRESS in uboot, is there any convenient command from sunxi-fel?
<apritzel>
dlan: that's in the user manual (CLU0_RVBARADDR0_L in 5.1.5.1 "CPU_SUBSYS_CTRL Register List"), should be 0x08001004