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I have done the tests, boot with a working SDcard, exchange the SDcard and press ENTER to mount card in slot 0 (Gigatron does not automatically mount the SDcard), then shows the error SD0: Mount failed. If I put a Sandisk SDcard in the Gigatron and power on the Gigatron, the screen shows the first photo (with the SD0 led permanently on), and after 6-7 seconds shows the secound photo with the error SD0: Mount failed (now the SD0 led is off, this can be seen in the photos). I have done the tests with 128Mb, 2Gb and 8Gb Sandisk SDcards, all the SDcards formatted with FAT32 with 512 bytes/sector, all failed, but using others brand of SDcards the tests all went fine.
Beware because I also tested the 8Gb Sandisk SDcard with the system.gt1/dev.rom that does not have the patch for SDcards < 4Gb and also failed, it seems to me that Sandisk SDcards have something weird with the Gigatron interface (maybe timings with the SPI protocol?) Try to use a Sandisk brand SDcard and see if it works to you or not.
Your program for memory test works very well, thanks. One question: do not understand "Including the gt1 into the ROM is better than including the gcl because compiling them in the same run pollutes the name space. Clashes can occur." This what means: the compilation of the dev.rom can fail or if compiled successfully and burned to a 27C1024 EPROM such ROM can fail in the Gigatron?
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