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-A Raspberry Pi 3 alacsony szintű programozása
-=============================================
-
-Üdvözöllek! Ez az oktatóanyag azok számára készült, akik szeretnének saját alacsony szintű (bare metal)
-programot írni a Raspberry Pi-jükre.
-
-A célközönsége elsősorban azok a hobby OS fejlesztők, akik most ismerkednek ezzel a hardverrel. Példákat mutatok
-arra, hogyan kell az alapfunkciókat megvalósítani, úgy mint soros vonalra írás, billentyűleütés kiolvasás, beállítani
-a képernyő felbontását és rajzolni rá. Azt is megmutatom, hogy kell az alaplap sorszámát és igazi, vas által
-generált véletlenszámot kiolvasni, valamint hogy hogyan kell fájlokat beolvasni a kártyáról.
-
-Ez az oktatóanyag *nem* arról szól, hogy hogyan írjunk operációs rendszert. Nem érint olyan témákat, mint a
-memória gazdálkodás, virtuális fájlrendszer kezelés, vagy hogy hogyan valósítsuk meg a multitaszkot. Ha saját
-OS-t szeretnél írni a Raspberry Pi-re, akkor javaslom előbb nézz körbe máshol, mielőtt folytatnád. Ez az
-oktatóanyag kifejezetten arról szól, hogy kommunikáljunk az adott hardverrel, és nem az operációs rendszerek
-hátteréről.
-
-Feltételezem, hogy elegendő GNU/Linux ismerettel rendelkezel, tudod, hogy kell programokat fordítani és lemez
-valamint fájlrendszer képfájlokat létrehozni. Nem fogok kitérni ezekre, bár pár apró tanácsot adok arról, hogy
-hogyan állítsuk be a kereszt-fordítót kifejezetten ehhez az architektúrához.
-
-Miért Raspberry Pi 3?
----------------------
-
-Több okból is erre esett a választásom: először is olcsó, könnyen beszerezhető. Másodszor teljesen 64 bites
-masina. Már réges rég felhagytam a 32 bites fejlesztéssel, mivel a 64 bit sokkal izgalmasabb. A címterülete
-hatalmas, nagyobb, mint a tárolókapacitás, ezért lehetővé teszi új, izgalmas megoldások létrehozását.
-Harmadsorban MMIO-t használ, amit könnyű programozni.
-
-32 bites oktatóanyagokhoz a következőket ajánlom:
-[Cambridge-i oktatóanyagok](http://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/os/) (ASM és csak 32 bites példák),
-[David Welch oktatóanyagai](https://github.com/dwelch67/raspberrypi) (főleg C, néhány 64 bites példával),
-[Peter Lemon oktatóanyagai](https://github.com/PeterLemon/RaspberryPi) (csak ASM, 64 bites példák is) and
-[Leon de Boer oktatóanyagai](https://github.com/LdB-ECM/Raspberry-Pi) (C és ASM, 64 bites és összetettebb példák is, mint USB és OpenGL).
-
-Előkészületek
--------------
-
-Mielőtt belevágnánk, szükséged lesz egy kereszt-fordítóra (lásd 00_crosscompiler könyvtár) és egy Micro SD
-kártyára néhány [firmware fájllal](https://github.com/raspberrypi/firmware/tree/master/boot) egy FAT partíción.
-
-Javaslom, hogy szerezz be egy [Micro SD kártya USB adaptert](http://media.kingston.com/images/products/prodReader-FCR-MRG2-img.jpg) 
-(sok gyártó eleve szállít ilyent az SD kártyáihoz), hogy könnyedén csatlakoztathasd az asztali gépedhez, mint egy
-pent, speciális kártya olvasó interfész nélkül (habár sok laptopban gyárilag van ilyen olvasó manapság).
-
-Az MBR partíciós táblát létre kell hozni az SD kártyán LBA FAT32 (0x0C típusú) partícióval, leformázni azt,
-majd rámásolni a *bootcode.bin*, *start.elf* és *fixup.dat* állományokat. Alternatívaként letöltheted a raspbian képfájlt,
-`dd`-vel rárakhatod a kártyára, majd mountolás után letörölheted a felesleges .img fájlokat. Amenyik szimpatikusabb. A lényeg
-az, hogy ezekben az oktatóanyagokban `kernel8.img` fájlokat gyártunk, amit a partíció gyökér könyvtárába kell másolni,
-és más `.img` kiterjesztésű fájl nem lehet ott.
-
-Javaslom továbbá, hogy vegyél egy [soros USB debug kábelt](https://www.adafruit.com/product/954). Ezt a GPIO 14-es
-és 15-ös lábára kell csatlakoztatni, az asztali gépen pedig a következő paranccsal kell elindítani a minicom-ot:
-
-```sh
-minicom -b 115200 -D /dev/ttyUSB0
-```
-
-Emulálás
---------
-
-Sajnálatos módon a hivatalos qemu bináris nem támogatja a Raspberry Pi 3-at egyenlőre. De van egy jó hírem, megírtam
-a támogatást hozzá, így hamarosan érkezik. Addig sajnos fordítani kell a qemu-t a legfrissebb forrásból. Miután
-lefordult, így tudod használni:
-
-```sh
-qemu-system-aarch64 -M raspi3 -kernel kernel8.img -serial stdio
-```
-
-Vagy (a fájl rendszer oktatóanyagok esetében)
-
-```sh
-qemu-system-aarch64 -M raspi3 -drive file=$(yourimagefile),if=sd,format=raw -serial stdio
-```
-
-Az első paraméter utasítja a qemu-t a Raspberry Pi 3 hardver emulálására. A második megadja a használandó kernel
-fájl (vagy a második esetben az SD kártya képfájl) nevét. Végezetül az utolsó paraméter lehetővé teszi, hogy az
-emulált gép UART0-ját átirányítsuk a qemu-t futtató terminál be- és kimenetére, azaz hogy minden, a virtuális gépen
-soros vonalra küldött karater megjelenjen a terminálon, az ott leütött karaktereket pedig kiolvashassuk a vm-en. Ez
-csak az 5-ös oktatóanyagtól működik, mivel az UART1 alapból *nem* irányítódik át. Ehhez plusz paraméterekre van szükség,
-mint például `-chardev socket,host=localhost,port=1111,id=aux -serial chardev:aux` (köszönet [@godmar](https://github.com/godmar)-nak az infóért).
-
-**!!!FIGYELEM!!!** Qemu emulálása felületes, csak a legáltalánosabb perifériákat támogatja! **!!!FIGYELEM!!!**
-
-Magáról a hardverről
---------------------
-
-Rengeteg oldal foglalkozik az interneten a Raspberry Pi 3 hardverének részletes bemutatásával, szóval itt rövid
-leszek, és csak az alapokat futjuk át.
-
-Az alaplapon egy [BCM2837 SoC](https://github.com/raspberrypi/documentation/tree/master/hardware/raspberrypi/bcm2837) csip
-található. Ebbe beszereltek
-
- - VideoCore grafikus processzort (GPU)
- - ARM-Cortex-A53 általános processzort (CPU, ARMv8)
- - És néhány MMIO-val leképzett perifériát.
-
-Érdekesség, hogy a nem a CPU a fő processzor. Amikor bekapcsoljuk, először a GPU kezd futni. Amikor végzett az
-inicializálásával, ami a bootcode.bin futtatását jelenti, betölti a start.elf programot. Ez nem egy ARM-es futtatható
-állomány, hanem a GPU-ra íródott. Ami számunkra érdekes, az az, hogy ez a start.elf különféle ARM futtathatók után
-kutat, melyek mind `kernel`-el kezdődnek, és `.img`-re végződnek. Mivel mi a CPU-t AArch64 módban fogjuk programozni,
-ezért nekünk a `kernel8.img` fájlra van szükségünk, ami a legutolsó keresett fájlnév. Miután betöltötte, a GPU magasba
-emeli az ARM processzor reset lábát, aminek hatására elkezdi a futtatást a 0x80000-as címen (egész pontosan a 0-ás
-címen, csak oda a GPU egy ARM ugrás utasítás rakott előtte).
-
-A RAM (1G a Raspberry Pi 3-on) meg van osztva a CPU és a GPU között, ezért az egyik tudja olvasni, amit a másik
-a memóriába írt. A félreértések elkerülése végett egy jól definiált, úgy nevezett levelesláda [mailbox](https://github.com/raspberrypi/firmware/wiki/Mailboxes)
-interfészt alakítottak ki. A CPU beletesz egy üzenetet a levesládába, és szól a GPU-nak, hogy üzenete van. A GPU
-(tudván, hogy a teljes üzenet a memóriában van) értelmezi azt, és ugyanarra a címre egy választ rak. A CPU-nak
-folyamatosan figyelni kell a memóriát, hogy végzett-e a GPU, és ha igen, akkor és csak akkor kiolvashatja a választ.
-
-Hasonlóan a perifáriák is a memórián keresztül kommunikálnak a CPU-val. Mindegyiknek saját dedikált címe van,
-0x3F000000-tól kezdődően, de ez nem igazi RAM (MMIO, memóriába leképzett ki- és bemenet). Namost itt nincs levelesláda,
-minden eszköz saját protokollt beszél. Ami közös, az az, hogy ez a memóriarész csak 32 bites adagokban, 4-el osztható
-címen írható / olvasható (szavak), és mindegyiknek kontroll/státusz illetve adat szavai vannak. Sajnálatos módon
-a Broadcom (a SoC gyártója) hírhedten szarul dokumentája a termékeit. A legjobb, ami van, a BCM2835-ös leírása, ami
-azért eléggé hasonló.
-
-Van továbbá lapcímfordító egység (MMU) a CPU-ban ami lehetővé teszi virtuális címterek használatát. Ez néhány
-speciális CPU rendszer regiszterrel programozható, és oda kell figyelni, amikor ezeket az MMIO területeket képezük le
-vele a virtuális címtérbe.
-
-Néhány az érdekesebb MMIO címek közül:
-```
-0x3F003000 - Rendszer Időzítő (System Timer)
-0x3F00B000 - Megszakítás vezérlő (Interrupt controller)
-0x3F00B880 - VideoCore levelesláda (VideoCore mailbox)
-0x3F100000 - Energiagazdálkodás (Power management)
-0x3F104000 - Véletlenszám generátor (Random Number Generator)
-0x3F200000 - Általános célú ki- és bemenet vezérlő (General Purpose IO controller)
-0x3F201000 - UART0 (soros port, PL011)
-0x3F215000 - UART1 (soros port, AUX mini UART)
-0x3F300000 - Külső tároló vezérlő (External Mass Media Controller, SD kártya olvasás)
-0x3F980000 - USB vezérlő (Universal Serial Bus controller)
-```
-A többi információ megtalálható a Raspberry Pi firmware wiki-ben és a documentation repóban a github-on.
-
-https://github.com/raspberrypi
-
-Sok szerencsét és élvezetes hekkelést a Raspberry-dhez! :-)
-
-bzt