Installing r2kaw and Tow-Boot to the SPI

[ethical_haquer]

I am trying to get r2kaw and Tow-Boot installed to the SPI of the PPP at the same time.
I can install Tow-Boot to the SPI, and I can install r2kaw to the SPI, but I haven't figured out how to have both on the SPI.

For installing Tow-Boot to the SPI, I can follow the Tow-Boot installation instructions for the PPP, under the "Installing to SPI (recommended)" section.
For installing rk2aw, I can follow the rk2aw installation instructions for the PPP, under the "Installation to SPI NOR flash" section.
Here is the relevant part of the rk2aw installation instructions:

Installation steps are:

1) Erase the SPI NOR flash compeltely and install rk2aw

  # for RK3399:

  ./rk2aw-spi-flasher --erase-all --rk2aw rk2aw/debug.img.spi

  # for other SoCs:

  ./rk2aw-spi-flasher --erase-all --rk2aw rk2aw/debug.img

2) Install U-Boot or other bootloader

  a) U-Boot
 
    ./rk2aw-spi-flasher \
      --uboot-spl u-boot-spl.bin \
      --uboot-tpl u-boot-tpl.bin \
      --uboot-itb u-boot.itb

    (The above 3 files are normal build artifacts of U-Boot. You get them from
    a regular defconfig U-Boot build for your board.)

  b) Other bootloaders

    ./rk2aw-spi-flasher \
      --spl levinboot-emmc.img

  If flashing fallback bootloader add --replace-fallback to the above commands.

Although the instructions mention U-Boot and "other bootloaders", they don't directly mention Tow-Boot. So my first question was, what category does Tow-Boot fall under? U-Boot, since it's based off U-Boot, or "other bootloaders".

After downloading and extracting the "pine64-pinephonePro-2023.07-007.tar.xz" file from the latest Tow-Boot release, this is what I got:

Code:

$ tree ./pine64-pinephonePro-2023.07-007
./pine64-pinephonePro-2023.07-007
├── binaries
│   ├── Tow-Boot.noenv.bin
│   └── Tow-Boot.spi.bin
├── config
│   ├── noenv.config
│   └── spi.config
├── shared.disk-image.img
└── spi.installer.img

3 directories, 6 files

So there aren't the three "u-boot-spl.bin", "u-boot-tpl.bin", and "u-boot.itb" files mentioned in the U-Boot instructions, nor are there Tow-Boot equivalents.

Next I tried using the "shared.disk-image.img" file for the "Other bootloaders" method:

Code:

./rk2aw-spi-flasher --spl shared.disk-image.img
...
ERROR: File shared.disk-image.img is too big for the buffer size 1048576

Then I tried with "spi.installer.img":

Code:

./rk2aw-spi-flasher --spl spi.installer.img
...
ERROR: File spi.installer.img is too big for the buffer size 1048576

That's what I've tried so far. Any tips would be appreciated!
TIA, ethical_haquer