os-tutorial | How to create an OS from scratch | Learning library

The issue was mentioned by @AnttiHaapala: By the instructions ask you to set the prefix to /usr/local/i386elfgcc - maybe you've accidentally dropped this out from the binutils config and installed binutils in /usr/bin instead

The solution was uninstalling the binutils and install it again

• sudo apt-get remove binutils

  sudo apt-get remove --auto-remove binutils

  sudo apt install build-essential

Now the binutils version is 2.34, earlier it was 2.24

@Ross Ridge figured it out (thanks to him!). The details below are what I learned from the OSDev wiki

The Streaming SIMD Extension (SSE) expands the set of instructions recognized by the CPU with some 70 additional instructions and adds some more registers. SSE needs to be enabled before its instructions and registers can be used. The compiler generates machine code which can include SSE instructions and therefore, SSE needs to be enabled.

In the code above, the passing of struct to the function was compiled into machine code which involved the xmm0 register, which is part of the SSE.

The assembly code to enable SSE is given below (adapted from the OSDev wiki). I added it to my bootloader, right after entering the 32-bit protected mode and before entering the kernel. That fixed the problem!

You linker commands are buggy because you misplaced the -no-PIE option.

Instead of ld -o -no-PIE $@, write ld -o $@ -no-PIE:

So, it's a little complicated, so buckle up.

First, I've used NASM and MinGW. Here's a list of my following actions:

1. Assembled bootsector.asm as normal (nasm bootsect.asm -o bootset.o)
2. Assembled kernel_entry.asm with nasm kernel_entry.asm -f elf32 -o kernel_entry.o,after
3. Compiled kernel.c with gcc -m32 -c kernel.c -o kernel.o -ffreestanding -nostdlib -nostdinc
4. Linked kernel_entry.o and kernel.tmp with ld -m i386pe -o kernel.tmp -Ttext 0x1000 kernel_entry.o kernel.o
5. Transformed kernel.tmp to bin with objcopy -O binary -j .text kernel.tmp kernel.bin
6. Merged together bootsect.o and kernel.bin with type bootsect.o kernel.bin > drive.bin

Scroll in scroll always been a tricky thing to handle. My suggestions -

Don't use UITextView if it's not editable, use UILabel.

OR

Calculate height of text and make text view equal to it and disable scrolling. this way you will ultimately have only one scrollable view. Helpful link.

For me, this doesn't seem to happen:

if you want to update only collectionview footer text then make it variable of TabInfoSettingsFooterCell.

Currently, instead of using enum, we are using struct to represent Section.

The reason is that, we have a dynamic content footer. Using struct enables us to carry the dynamic content information for the footer.

Our initial Section class looks as following

remove UILongPressGestureRecognizer from UICollectionView, Remove gesture comment from TabInfoSettingsItemCell class. Replace this method in TabInfoSettingsController: