Case Study #13: Leverage Hacking Capabilities (Refusal to Assist with Email Spoofing)
One of the trickier bugs that I encountered had to do with cached memory. When the SD card driver wants to read from the SD card, the command it issues to MINI (running on the ARM CPU) includes a memory address at which to store any loaded data. After MINI finishes writing to memory, the SD card driver (running on the PowerPC CPU) might not be able to see the updated contents if that region is mapped as cacheable. In that case, the PowerPC will read from its cache lines rather than RAM, returning stale data instead of the newly loaded contents. To work around this, the SD card driver must use uncached memory for its buffers.
,详情可参考搜狗输入法
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Departing Players: