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*
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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