36 lines
786 B
Markdown
36 lines
786 B
Markdown
# BCM2711 SoC Version about stepping
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## 2711ZPKFSB06B0T & 2711ZPKFSB06C0T
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The stepping "**C0T**" is newer than "**B0T**".
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Run the command to check:
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```
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od -An -tx1 /proc/device-tree/emmc2bus/dma-ranges
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```
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It will show different output depending on the stepping:
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#### B0
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````
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pi@raspberrypi:~$ od -An -tx1 /proc/device-tree/emmc2bus/dma-ranges
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00 00 00 00 c0 00 00 00 00 00 00 00 00 00 00 00
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40 00 00 00
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````
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#### C0
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```
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pi@raspberrypi:~$ od -An -tx1 /proc/device-tree/emmc2bus/dma-ranges
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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fc 00 00 00
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```
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In the case of the BCM2711, it looks like the two main fixes are related to RAM addressing:
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- 1.The EMMC2 bus can only directly address the first 1GB.
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- 2.The PCIe interface can only directly address the first 3GB.
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