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UART question: Rescue Loader / UART loopback switch

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Offline hardlock

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Re: UART question: Rescue Loader / UART loopback switch
« Reply #50 on: 23 / November / 2017, 14:35:06 »
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Quote from: Ant on 23 / November / 2017, 14:07:41
This is because of cache. 0x40000000 bit means uncahed memory...


Did i get it right: SD card sends data directly to  DRAM, and it is being later overwritten by data flushed from the CPU cache (if any)?

ok, I have managed to start an encoded DISKBOOT.BIN (a simplisitic blinker so far) from a freshly formatted SD card but only with '#' spamming, hardware loopback never worked, it always stopped on '#' sign for me.

thank you very much for the help!
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Offline Ant

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Re: UART question: Rescue Loader / UART loopback switch
« Reply #51 on: 23 / November / 2017, 14:47:17 »
Quote from: hardlock on 23 / November / 2017, 14:35:06
Did i get it right: SD card sends data directly to  DRAM, and it is being later overwritten by data flushed from the CPU cache (if any)?

Something like that(when you load file to 0x40008000)
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