demonguy questions

• Why u-boot can put global data's address into r9 register?
• How to translate pem public key into openssl RSA* structure
• Why does arm-linux-gcc only reserve r0-r4 when entering IRQ mode
• How to import two versions of the same python module at the same time?
• Why do we need to call poll_wait in poll?
• How does kbuild actually work?

demonguy answers