The uncompensated temperature of the BMP180 is incorrectly converted to a 16-bit signed value, instead of a 32-bit signed value (long). Since the data is 16-bits wide and can therefore not be negative, the easy fix would be to do the following:

sip.js(1128): uncompensated = uint16(data[0], data[1]);

Please see page 15 of the manual of the BMP180 chip:
https://ae-bst.resource.bosch.com/media

It seems that tinygo doesn't not support MIPS based embedded devices out of the box, although LLVM does support the following:

    mips       - MIPS (32-bit big endian)
    mips64     - MIPS (64-bit big endian)
    mips64el   - MIPS (64-bit little endian)
    mipsel     - MIPS (32-bit little endian)

My intent is to execute the tinygo compiled binary within a mipsel linux box, no

Since Pi 4, Pis now have multiple GB of RAM so using Mb is obtuse.

When you run pinout on an GB Pi 4, it shows 1024Mb, 2048Mb, 4096Mb, 8192Mb. Would be better to show 1GB/2GB/4GB/8GB.

It shouldn't change in pi_info() but should change in pinout output.