Tiny Core Base > Raspberry Pi
piCore for DUMMIES
Yleisajattelija:
Before using piCore, healthy HW is needed.
"Clean" SOC costs 3€:
https://www.ebay.com/itm/272614818888?_skw=BCM2837B0&itmmeta=01J7WP76581B8CBB2F17794B9K&hash=item3f791c0448:g:9KEAAOSw4CFY4GyZ&itmprp=enc%3AAQAJAAAA4HoV3kP08IDx%2BKZ9MfhVJKmCF%2BlHtsRSUIR5wAqucnxrgYNAX612rQJXowrY7suep8o8uarCuKR3GiACLVLuXDdMXJ0ejAWQyyC1NsHrTDeHYsQcotwbC39oCKXXhQPgYr0C69eLNU%2BbajgX7e9qGon4vWSFNzJjiNL%2Bcqs7ocvKGEKT54C9kbdOcU5h5YC4QpR7ifbossqPKmxlDt%2F7uuEka0usyga5J4LbGPrlTAej6foJUgu2%2FMzeeUkdwHPnjOT22nwKcssnfR514Ti%2BY9NbvV%2FMdr6idtCcRkW10vuS%7Ctkp%3ABk9SR9zinJa_ZA
mocore:
--- Quote from: Yleisajattelija on September 16, 2024, 01:56:21 AM ---Before using piCore, healthy HW is needed.
"Clean" SOC costs 3€:
--- End quote ---
is this the opening chapter ?
Yleisajattelija:
--- Quote from: mocore on September 16, 2024, 04:42:15 AM ---
--- Quote from: Yleisajattelija on September 16, 2024, 01:56:21 AM ---Before using piCore, healthy HW is needed.
"Clean" SOC costs 3€:
--- End quote ---
is this the opening chapter ?
--- End quote ---
I thought that this is The-Pro-Distro... :-)
For piCore bootloader Broadcom bootloading JTAG-spesification is needed (which it's very difficult to get) and making propietary bootloader for this kind of multiprocessor environmet it is (of course) very challenging job.
Yleisajattelija:
QYSA: What in earth newbie need this topic for microchip internals and bootloader, especially if you cannot accsess whole thing?
A: To use piCore you need a hardware, and it have to be Rasperry in this case. As discussed, Rasperry seems to keep secret information for bootload process and transition from real mode to protected mode. This transition is typically one-way door, and after that bootloader code executed nobody (exept preloaded system code) has direct access to physical memories and I/O -hardware registers. That means lot of problems when you need to write new device drivers or have to fix problems with old ones. One spesific problem is memory setup, after transition to protected mode MMU is initialized and memories mapped to virtual space. If physical memories are changed, this mapping (typically) must be done again, and unfortunatelly for security reasons it must be typically made before transition to protected mode. But this memory mapping may be secret and anyway must be done by Rasberry, in this case. There is some ways to avoid this problems, typically special memory-map files on bootload process, but it difficult and very complex. This may be serious problem for other linux distros port to Rasberry, and may even prohibit it.
Rich:
Hi Yleisajattelija
--- Quote from: Yleisajattelija on September 16, 2024, 01:56:21 AM ---Before using piCore, healthy HW is needed.
"Clean" SOC costs 3€:
https://www.ebay.com/itm/272614818888
--- End quote ---
I just wanted to point out something I noticed in that sellers ad.
Instead of using a piece of anti-static foam to display their product, they
chose to use what appears to be carpeting. Possibly composed of a man
made fiber such as polyester, acrylic, nylon, etc:
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