damn, it booted to the prompt on 1.5G with the hack after applying these 2 
patches
https://github.com/armbian/build/blob/main/patch/u-boot/u-boot-sunxi/allwinner-h616-THS-workaround.patch
https://github.com/armbian/build/blob/main/patch/u-boot/u-boot-sunxi/allwinner-h616-GPU-enable-hack.patch

for THS (thermal sensor) ref:
https://patchwork.kernel.org/project/linux-pm/patch/20230821-ths-h616-v2-2-cda60d556...@somainline.org/

I'm not too sure why it didn't work if I did not enable the GPU as well.
I'd think these are more appropriate for the (linux) kernel drivers to 
initialize them

uname -a
Linux orangepizero3 6.7.10-edge-sunxi64 #2 SMP Sat Mar 16 02:22:41 +08 2024 
aarch64 GNU/Linux

On Thursday, April 25, 2024 at 5:26:21 PM UTC+8 andrew g wrote:

> just in case anyone has a board and wants to try it out, the image for 
> Orange Pi Zero 3 I'm messing with is this, note *unofficial*, and this link 
> won't be there on a permanent basis
>
> https://www.mediafire.com/file/bym559l94sn8xyd/Armbian-unofficial_24.5.0-trunk_Orangepizero3_bookworm_edge_6.7.10_minimal20240320.7z/file
>
> Armbian has 'official' ones here, based on 6.6.x as seen on the page, 
> scroll right below for the links
> https://www.armbian.com/orange-pi-zero-3/
> in my own tests the 'official' ones has a 'goofed' /boot/boot.scr or 
> /boot/boot.cmd the last time (days ago) I checked, it is the reason I'm 
> testing my 1.5 G hack on my images which is build from the armbian build 
> framework
> https://github.com/armbian/build
>
> On Thursday, April 25, 2024 at 4:56:54 PM UTC+8 andrew g wrote:
>
>> Applied 2 cortex_a53 erratum for BL31 stage in arm trusted firmware
>> INFO:    BL31: cortex_a53: CPU workaround for erratum 855873 was applied
>> INFO:    BL31: cortex_a53: CPU workaround for erratum 1530924 was applied
>>
>> still not getting past that 'gpu overtemperature' bug. full boot messages:
>> full boot log:
>> U-Boot SPL 2024.04-00757-FixOPiZero3_1.5G (Apr 25 2024 - 16:47:05 +0800)
>> sunxi_board_init
>> DRAM:sunxi_dram_initdetected memsize 2048 M
>>  2048 MiB
>> spl_board_init_r
>>
>> Trying to boot from MMC1
>> NOTICE:  BL31: v2.10.0(debug):v2.10.0-729-gc8be7c08c
>> NOTICE:  BL31: Built : 16:43:26, Apr 25 2024
>>
>> NOTICE:  BL31: Detected Allwinner H616 SoC (1823)
>> NOTICE:  BL31: Found U-Boot DTB at 0x4a0b4330, model: OrangePi Zero3
>> INFO:    ARM GICv2 driver initialized
>> INFO:    Configuring SPC Controller
>> INFO:    PMIC: Probing AXP305 on RSB
>>
>> ERROR:   RSB: set run-time address: 0x10003
>> INFO:    Could not init RSB: -65539
>> INFO:    BL31: Platform setup done
>> INFO:    BL31: Initializing runtime services
>> INFO:    BL31: cortex_a53: CPU workaround for erratum 855873 was applied
>> INFO:    BL31: cortex_a53: CPU workaround for erratum 1530924 was applied
>> INFO:    PSCI: Suspend is unavailable
>> INFO:    BL31: Preparing for EL3 exit to normal world
>> INFO:    Entry point address = 0x4a000000
>> INFO:    SPSR = 0x3c9
>> INFO:    Changed devicetree.
>>
>> U-Boot 2024.04-00757-FixOPiZero3_1.5G (Apr 25 2024 - 16:47:05 +0800) 
>> Allwinner Technology
>>
>>
>> CPU:   Allwinner H616 (SUN50I)
>> Model: OrangePi Zero3
>> DRAM:  2 GiB
>> Core:  58 devices, 25 uclasses, devicetree: separate
>> WDT:   Not starting watchdog@30090a0
>> MMC:   mmc@4020000: 0
>> Loading Environment from FAT... Unable to use mmc 0:1...
>> In:    serial@5000000
>> Out:   serial@5000000
>> Err:   serial@5000000
>> Allwinner mUSB OTG (Peripheral)
>> Net:   eth0: ethernet@5020000using musb-hdrc, OUT ep1out IN ep1in STATUS 
>> ep2in
>> MAC de:ad:be:ef:00:01
>> HOST MAC de:ad:be:ef:00:00
>> RNDIS ready
>> , eth1: usb_ether
>> starting USB...
>> Bus usb@5200000: USB EHCI 1.00
>> Bus usb@5200400: USB OHCI 1.0
>> scanning bus usb@5200000 for devices... 1 USB Device(s) found
>> scanning bus usb@5200400 for devices... 1 USB Device(s) found
>>        scanning usb for storage devices... 0 Storage Device(s) found
>> Hit any key to stop autoboot:  0
>> switch to partitions #0, OK
>> mmc0 is current device
>> Scanning mmc 0:1...
>> Found U-Boot script /boot/boot.scr
>> 3259 bytes read in 4 ms (794.9 KiB/s)
>> ## Executing script at 4fc00000
>> U-boot loaded from SD
>> Boot script loaded from mmc
>> 156 bytes read in 4 ms (38.1 KiB/s)
>> 32823 bytes read in 10 ms (3.1 MiB/s)
>> Working FDT set to 4fa00000
>> 4203 bytes read in 9 ms (456.1 KiB/s)
>> Applying kernel provided DT fixup script (sun50i-h616-fixup.scr)
>> ## Executing script at 45000000
>> 10936176 bytes read in 458 ms (22.8 MiB/s)
>> 23570440 bytes read in 983 ms (22.9 MiB/s)
>> Moving Image from 0x40080000 to 0x40200000, end=41910000
>> ## Loading init Ramdisk from Legacy Image at 4ff00000 ...
>>    Image Name:   uInitrd
>>    Image Type:   AArch64 Linux RAMDisk Image (gzip compressed)
>>    Data Size:    10936112 Bytes = 10.4 MiB
>>    Load Address: 00000000
>>    Entry Point:  00000000
>>    Verifying Checksum ... OK
>> ## Flattened Device Tree blob at 4fa00000
>>    Booting using the fdt blob at 0x4fa00000
>> Working FDT set to 4fa00000
>>    Loading Ramdisk to 49592000, end 49ffff30 ... OK
>>    Loading Device Tree to 0000000049521000, end 0000000049591fff ... OK
>> Working FDT set to 49521000
>>
>> Starting kernel ...
>>
>> [    2.149838] thermal thermal_zone0: gpu-thermal: critical temperature 
>> reached, shutting down
>> [    2.158312] reboot: HARDWARE PROTECTION shutdown (Temperature too high)
>> [    2.192000] reboot: Power down
>> ---
>>
>> this is on a 2 GB board where the 'stock' Armbian u-boot boots just fine.
>> this doesn't have that 1.5GB hard coding.
>>
>> On Thursday, April 25, 2024 at 3:35:00 PM UTC+8 andrew g wrote:
>>
>>> I just did that test, I removed that 1.5GB hardcoding from mainline 
>>> u-boot build as of current 
>>> memsz = 2048UL * 1024UL * 1024UL * 3 / 4;
>>>
>>> patched the hacked u-boot into my Armbian (Debian bookworm, linux 6.7) 
>>> image.
>>>
>>> I got the same
>>> U-Boot 2024.04-00757-FixOPiZero3_1.5G 
>>> ...
>>> Starting kernel ...
>>>
>>> [    2.145316] thermal thermal_zone0: gpu-thermal: critical temperature 
>>> reached, shutting down
>>> [    2.153753] reboot: HARDWARE PROTECTION shutdown (Temperature too 
>>> high)
>>> [    2.180852] reboot: Power down
>>>
>>> message on a 2 GB board, so I'm missing something that is there in 
>>> Armbian u-boot 
>>>
>>> On Thursday, April 25, 2024 at 2:19:01 PM UTC+8 andrew g wrote:
>>>
>>>> the statment 
>>>> >> if it is run with the mainline u-boot without this hack and the 
>>>> 'standard' boards e.g. 2G, 4G, it boots just fine. But that with the hack 
>>>> and on 1.5G Orange Pi Zero 3 board (I've only 1 of that) I get this gpu 
>>>> overheating goof on boot.
>>>>
>>>> isn't really correct, with *stock* Armbian u-boot (which is based on 
>>>> mainline) it boots 1G, 2G, 4G 'standard' H618 (Orange Pi Zero 3) boards.
>>>> I'm not too sure if I'd build mainline u-boot from the trunk as of 
>>>> current, if that 'just works'.
>>>> that 'gpu overheating' thing is seen after I 'solved' the '1.5G issue' 
>>>> with the hack, then comes the 'gpu overheating' message, and it is 
>>>> reproducible on my 1.5G board practically for all boots.
>>>> I simply install and replace u-boot over that in the distribution in 
>>>> the sd-card.
>>>>
>>>> On Thursday, April 25, 2024 at 2:07:45 PM UTC+8 andrew g wrote:
>>>>
>>>>> on a 'longer term', if after all this *hack* (hard coding memory size) 
>>>>> works,  I'd guess a possible way is to read custom memory size from an 
>>>>> 'environment variable' say set by scripts in /boot/boot.scr or 
>>>>> /boot/boot.cmd in the root partition
>>>>> or perhaps in a DTS overlay. There is a 'chicken and egg' problem as 
>>>>> u-boot needs to setup and initialize dram and relocate itself into dram 
>>>>> to 
>>>>> run for H616 and H618. The hack by hardcoding dram works, but I'd guess 
>>>>> that reading /parsing /boot/boot.scr or /boot/boot.cmd would need to be 
>>>>> done in the relocated u-boot.
>>>>>
>>>>> On Thursday, April 25, 2024 at 1:49:28 PM UTC+8 andrew g wrote:
>>>>>
>>>>>> oops the 1st link should be
>>>>>>
>>>>>> https://forum.armbian.com/topic/29202-orange-pi-zero-3/page/20/#comment-188030
>>>>>> with the spoiler in it
>>>>>>
>>>>>> the comment ref should be 188030 rather than 188328
>>>>>>
>>>>>>
>>>>>> On Thursday, April 25, 2024 at 1:45:06 PM UTC+8 andrew g wrote:
>>>>>>
>>>>>> hi Andre Przywara,
>>>>>>
>>>>>> Thanks for your response.
>>>>>>
>>>>>> According to this thread, the author who has worked on the H616 and 
>>>>>> H618 dram codes including that '1.5G issue'
>>>>>> https://forum.openwrt.org/t/can-someone-make-a-build-for-
>>>>>> orange-pi-zero-3/168930/38?u=ag1233
>>>>>>
>>>>>> For DDR4 (chips, and I'm not sure if it is that chip or all chips), 
>>>>>> because address wraps around to some unknown address. Hence, it is not 
>>>>>> possible to make generic codes that possibly caters to some (other) 
>>>>>> combination of memory size.
>>>>>> And 'hacks' is about the only way.
>>>>>>
>>>>>> I (we (in Armbian forums)) tried some stuff:
>>>>>>
>>>>>> I did this hack
>>>>>> https://forum.armbian.com/topic/29202-orange-pi-zero-3/
>>>>>> page/20/#comment-188328
>>>>>> static unsigned long mctl_calc_size(const struct dram_config *config)
>>>>>> {
>>>>>>         u8 width = config->bus_full_width ? 4 : 2;
>>>>>>
>>>>>>         /* 8 banks */
>>>>>>         unsigned long long memsz = (1ULL << (config->cols + 
>>>>>> config->rows + 3))
>>>>>>                 * width * config->ranks;
>>>>>>         log_info("detected memsize %d M\n", (int)(memsz >> 20));
>>>>>>         /* 1.5 GB hardcoded */
>>>>>>         memsz = 2048UL * 1024UL * 1024UL * 3 / 4;
>>>>>>         return memsz;
>>>>>> }
>>>>>>
>>>>>> 1.5G is *hardcoded*, build a custom u-boot and we (in Armbian forums) 
>>>>>> ventured with some experiments:
>>>>>> in the same comment 
>>>>>> https://forum.armbian.com/topic/29202-orange-pi-zero-3/
>>>>>> page/20/#comment-188328
>>>>>> Unhide the spoiler, for Armbian distribution built based on Debian 
>>>>>> bookwork and mainline Linux 6.7 kernel (possibly with a patched DTS as 
>>>>>> well, on top of that already there for Zero 3 and Zero 2W).
>>>>>>
>>>>>> Currently that causes during linux boot:
>>>>>> [    2.144698] thermal thermal_zone0: gpu-thermal: critical 
>>>>>> temperature reached, shutting down
>>>>>> [    2.153147] reboot: HARDWARE PROTECTION shutdown (Temperature too 
>>>>>> high)
>>>>>> [    2.192185] reboot: Power down
>>>>>>
>>>>>> if it is run with the mainline u-boot without this hack and the 
>>>>>> 'standard' boards e.g. 2G, 4G, it boots just fine. But that with the 
>>>>>> hack 
>>>>>> and on 1.5G Orange Pi Zero 3 board (I've only 1 of that) I get this gpu 
>>>>>> overheating goof on boot.
>>>>>>
>>>>>> Someone else who had some issues detecting memory size with the 
>>>>>> Orange Pi vendor distributions (based on 6.1 kernels I think)
>>>>>> , tried the 1.5 G hacked u-boot replacing that in (patched into) 
>>>>>> Orange Pi vendor distributions.
>>>>>> https://forum.armbian.com/topic/29202-orange-pi-zero-3/?
>>>>>> do=findComment&comment=188078
>>>>>> Unfortunately, it turns out that (Orange Pi's distributed) u-boot is 
>>>>>> customized / different and it 'crashes' when (this hacked mainline) 
>>>>>> u-boot 
>>>>>> tries to include/call /boot/boot.scr (or /boot/boot.cmd) scripts in the 
>>>>>> root filesystem.
>>>>>>
>>>>>> This is currently the 'state of art' and I'm yet to figure out that 
>>>>>> 'gpu overheating' bug, which is obviously a bug (perhaps I've not 
>>>>>> considered some things)
>>>>>>
>>>>>> On Monday, April 22, 2024 at 10:15:37 PM UTC+8 Andre Przywara wrote:
>>>>>>
>>>>>> On Thu, 18 Apr 2024 22:40:59 -0700 (PDT) 
>>>>>> "'andrew g' via linux-sunxi" <linux...@googlegroups.com> wrote: 
>>>>>>
>>>>>> Hi Andrew, 
>>>>>>
>>>>>> > background: 
>>>>>> > 
>>>>>> > currently Armbian linux use the 'mainline u-boot' 
>>>>>> > https://source.denx.de/u-boot/u-boot 
>>>>>>
>>>>>> Thanks for using mainline! 
>>>>>>
>>>>>> > however, it has a '1.5GB' problem in that boards with 1.5GB DRAM is 
>>>>>> > detected incorrectly. 
>>>>>> > It detects 2GB instead possibly due to address wraparound, so the 
>>>>>> boot 
>>>>>> > crashes mid stream. 
>>>>>> > I'm trying to build a custom u-boot for a 'hack' i.e. to return 
>>>>>> 1.5GB dram 
>>>>>> > from the memory initialization and setup functions. in part to 
>>>>>> explore 
>>>>>> > solutions 
>>>>>>
>>>>>> So yes, as you figured, the 1.5GB setup is not supported yet, mostly 
>>>>>> because no one with a board fixed that and sent a proper patch. 
>>>>>>
>>>>>> There is this patch here - but please note that this is hack: 
>>>>>>
>>>>>> https://lore.kernel.org/u-boot/20240413134352...@189.cn/T/#u 
>>>>>> <https://lore.kernel.org/u-boot/20240413134352.46495-1-da...@189.cn/T/#u>
>>>>>>  
>>>>>>
>>>>>>
>>>>>> However in his reply Jernej gives some hints on what to do for a 
>>>>>> proper 
>>>>>> solution. 
>>>>>>
>>>>>> So you might want to try this. Bonus points for trying to follow 
>>>>>> Jernej's 
>>>>>> hints and implementing that! 
>>>>>>
>>>>>> Cheers, 
>>>>>> Andre 
>>>>>>
>>>>>> P.S. Your build sequence below looks correct, and nice work on 
>>>>>> digging into 
>>>>>> the sequence. I sketched the U-Boot early code flow here: 
>>>>>> https://linux-sunxi.org/U-Boot/Boot_process 
>>>>>>
>>>>>> > 
>>>>>> > what I tried and issues: 
>>>>>> > I'm building u-boot from 
>>>>>> > https://source.denx.de/u-boot/u-boot 
>>>>>> > basically following these instructions 
>>>>>> > https://docs.u-boot.org/en/latest/board/allwinner/sunxi.html 
>>>>>> > 
>>>>>> > my shell script ot build u-boot is like 
>>>>>> > #!/usr/bin/bash 
>>>>>> > export BL31=../arm-trusted-firmware/build/sun50i_h616/release/bl31.bin 
>>>>>>
>>>>>> > make orangepi_zero3_defconfig 
>>>>>> > CROSS_COMPILE=aarch64-linux-gnu- make 
>>>>>> > 
>>>>>> > where the bl31 module from arm-trusted-firmware is in its own 
>>>>>> directory 
>>>>>> > build with 
>>>>>> > make CROSS_COMPILE=aarch64-linux-gnu- PLAT=sun50i_h616 
>>>>>> > 
>>>>>> > I did succeed with building u-boot and flashed the u-boot SPL into 
>>>>>> the sd 
>>>>>> > card 
>>>>>> > sudo dd if=u-boot-sunxi-with-spl.bin of=/de 
>>>>>> > v/sde bs=1024 seek=8 
>>>>>> > 
>>>>>> > and it actually boots, but : 
>>>>>> > U-Boot SPL 2024.04-00757-gbeac958153-dirty (Apr 19 2024 - 12:46:06 
>>>>>> +0800) 
>>>>>> > DRAM: 0 MiB 
>>>>>> > Trying to boot from MMC1 
>>>>>> > NOTICE: BL31: v2.10.0(release):v2.10.0-729-gc8be7c08c 
>>>>>> > NOTICE: BL31: Built : 23:11:18, Apr 18 2024 
>>>>>> > NOTICE: BL31: Detected Allwinner H616 SoC (1823) 
>>>>>> > NOTICE: BL31: Found U-Boot DTB at 0x4a0be348, model: OrangePi Zero3 
>>>>>> > ERROR: RSB: set run-time address: 0x10003 
>>>>>> > U-Boot 2024.04-00757-gbeac958153-dirty (Apr 19 2024 - 12:46:06 
>>>>>> +0800) 
>>>>>> > Allwinner Technology 
>>>>>> > 
>>>>>> > size=30, ptr=590, limit=2000: 26370 
>>>>>> > CPU: Allwinner H616 (SUN50I) 
>>>>>> > Model: OrangePi Zero3 
>>>>>> > DRAM: 0 Bytes 
>>>>>> > 
>>>>>> > So apparently the DRAM is not detected. I tried tracing flow 
>>>>>> execution by 
>>>>>> > placing 
>>>>>> > debug("tag"); or log_info("tag") in 
>>>>>> > board_init_f() 
>>>>>> > https://source.denx.de/u-boot/u-boot/-/blob/master/arch/arm/
>>>>>> mach-sunxi/board.c?ref_type=heads#L457 
>>>>>> > and 
>>>>>> > sunxi_dram_init() 
>>>>>> > https://source.denx.de/u-boot/u-boot/-/blob/master/arch/arm/
>>>>>> mach-sunxi/dram_sun50i_h616.c?ref_type=heads#L1377 
>>>>>> > 
>>>>>> > however, none of my tags are printed, which implies that the 
>>>>>> initialization 
>>>>>> > routines for both the board and sunxi_dram_init() are not called. 
>>>>>> > 
>>>>>> > I did configure logging to be pretty verbose in .config 
>>>>>> > # 
>>>>>> > # Logging 
>>>>>> > # 
>>>>>> > CONFIG_LOG=y 
>>>>>> > CONFIG_LOG_MAX_LEVEL=8 
>>>>>> > CONFIG_LOG_DEFAULT_LEVEL=8 
>>>>>> > CONFIG_LOG_CONSOLE=y 
>>>>>> > 
>>>>>> > I'm not sure what else could be wrong or how to go about it 
>>>>>> further. 
>>>>>> > 
>>>>>> > 
>>>>>>
>>>>>>

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