[U-Boot-Users] Do we enable Interrupts in U-Boot?

[Andreas Schweigstill <andreas@schweigstill.de>]

Hello!

Chetan Nanda schrieb:
> In that case there must be some threads that continuously check for
> pending requests from UART, ETHERNET or so ..
> But I don't find any sort  of threading inside u-boot code

No, the peripherals get only polled when they are used. That's why
a device running U-Boot usually won't respond to ping/ICMP echo.
Network driver polling only occurs from NetLoop(); this function will
be used only for most (all?) network commands.

U-Boot doesn't implement any kind of threading. Keep in mind that U-Boot
is *not* an operating system but only a bootloader.

There have been lots of requests for some kind of multitasking but it
would be quite time-consuming to implement this without breaking
compatibility with many software parts why rely on the fact that they
have full control over the system when running.

Regards
Andreas Schweigstill

-- 
Dipl.-Phys. Andreas Schweigstill
Schweigstill IT | Embedded Systems
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