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| 11:16.09 | aproemel | hi together |
| 11:16.32 | aproemel | vmaster: i've finished my serial loader, to copy uboot into ram |
| 11:17.23 | aproemel | but maybe i've done a design failure of my board :-( |
| 11:37.39 | vmaster | hey aproemel |
| 11:38.16 | aproemel | do you know if uboot requieres a serial data flash ? |
| 11:39.13 | vmaster | it definitely doesn't require one |
| 11:39.20 | vmaster | it can support one, if you have it |
| 11:39.35 | aproemel | great, then i haven't done a design mistake |
| 11:39.53 | aproemel | because every board i looked at, has serial data flash |
| 11:40.55 | aproemel | but i found something strange |
| 11:41.31 | aproemel | my loader configs the board with 180/90 MHz and 115200 Baud |
| 11:42.10 | aproemel | all works fine, until i start uboot out of SDRAM, then serial output isn't working |
| 11:42.32 | aproemel | if I config the board with 180/60 115200 everything works fine |
| 11:43.10 | aproemel | I took the uboot.bin shipped with my embest demo board |
| 11:43.22 | vmaster | might be a problem with the board layout or with your sdram timing |
| 11:43.31 | aproemel | sdram works fine, in both modes |
| 11:43.48 | vmaster | how did you verify that? |
| 11:44.00 | aproemel | wrote a test util |
| 11:44.06 | aproemel | write a datum to an address |
| 11:44.22 | aproemel | read it, modified it, write it back again, read it again |
| 11:44.44 | vmaster | well, in u-boot's normal mode of operation, u-boot is responsible for bringing clocks and memory up and running |
| 11:44.44 | aproemel | First i write whole 32MB |
| 11:44.57 | vmaster | so your u-boot.bin might touch these settings |
| 11:45.22 | aproemel | i know |
| 11:45.32 | aproemel | but if uboot change the clocks etc |
| 11:45.39 | aproemel | but hold the 115200 baud rate |
| 11:46.10 | aproemel | i should get correct characters via rs232, and not any ascii garbash |
| 11:46.59 | aproemel | but it works with 180/60 so i'll let it unmodified, and set correct speed later, when linux is running |
| 11:48.10 | vmaster | UART timings often depends on the bus clock |
| 11:48.33 | aproemel | yes, but its hard to explain, what i mean |
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| 17:51.11 | *** topic/#openjtag is this is the place to discuss bootloaders and JTAG |
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