Supported microSD cards/SD-C02G
From Openmoko
(card still failing sometimes) |
(did not find stable settings) |
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| − | '''Kingston SD-C02G''' works fine at good GSM coverage with the following kernel parameters here (GTA02 with GPS capacitor fix on uSD slot): | + | '''Kingston SD-C02G''' works fine '''at good GSM coverage''' with the following kernel parameters here (GTA02 with GPS capacitor fix on uSD slot): |
glamo_mci.sd_max_clk=10000000 glamo_mci.sd_drive=2 | glamo_mci.sd_max_clk=10000000 glamo_mci.sd_drive=2 | ||
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Sep 15 14:15:20 debian-gta02 kernel: glamo-mci glamo-mci.0: Error after cmd: 0x4304 | Sep 15 14:15:20 debian-gta02 kernel: glamo-mci glamo-mci.0: Error after cmd: 0x4304 | ||
| − | Drive strength of 0 at glamo_mci.sd_max_clk=10000000 is pretty reliable at normal operation (at good GSM reception), but still fails sometimes when GPRS is activated. Drive strength of 2 still fails repeatably when using GSM in less populated area. | + | Drive strength of 0 at glamo_mci.sd_max_clk=10000000 is pretty reliable at normal operation (at good GSM reception), but still fails sometimes when GPRS is activated. Drive strength of 2 still fails repeatably when using GSM in less populated area or when accessing SD card directly after entering PIN. |
(last verified using 2008.8 and newer daily kernel versions) | (last verified using 2008.8 and newer daily kernel versions) | ||
| + | |||
| + | Tested: | ||
| + | * SD idle clock = on does not prevent the errors | ||
| + | * Errors occur almost every time when loading things from SD card while entering PIN, even at drive strength of 3 and clock speed of 2.5 Mhz | ||
TODO: | TODO: | ||
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* Try to reproduce that GSM affects SD data lines themselves, not only the card | * Try to reproduce that GSM affects SD data lines themselves, not only the card | ||
* Verify that screen sometimes filling with random data when card fails is related to failing card, and not to failing glamo which in turn results in card errors. | * Verify that screen sometimes filling with random data when card fails is related to failing card, and not to failing glamo which in turn results in card errors. | ||
| − | * | + | * Find out if it also happens in areas without GSM buzz. |
[[Category:Neo FreeRunner Hardware]] | [[Category:Neo FreeRunner Hardware]] | ||
Revision as of 20:26, 21 October 2008
Kingston SD-C02G works fine at good GSM coverage with the following kernel parameters here (GTA02 with GPS capacitor fix on uSD slot):
glamo_mci.sd_max_clk=10000000 glamo_mci.sd_drive=2
Lower drive strength or or higher clock speed cause unreliable behavior if the GSM modem is activated (either directly after entering the PIN, when making a call, or using GPRS - more often while having bad GSM reception and using GPRS):
Sep 15 14:15:20 debian-gta02 kernel: mmcblk0: error -84 sending read/write command
Sep 15 14:15:20 debian-gta02 kernel: glamo-mci glamo-mci.0: Error after cmd: 0x4304
Drive strength of 0 at glamo_mci.sd_max_clk=10000000 is pretty reliable at normal operation (at good GSM reception), but still fails sometimes when GPRS is activated. Drive strength of 2 still fails repeatably when using GSM in less populated area or when accessing SD card directly after entering PIN.
(last verified using 2008.8 and newer daily kernel versions)
Tested:
- SD idle clock = on does not prevent the errors
- Errors occur almost every time when loading things from SD card while entering PIN, even at drive strength of 3 and clock speed of 2.5 Mhz
TODO:
- Verify the card is indeed the only one affected (ruling out FreeRunner HW problems is hard, only got one)
- Try to reproduce that GSM affects SD data lines themselves, not only the card
- Verify that screen sometimes filling with random data when card fails is related to failing card, and not to failing glamo which in turn results in card errors.
- Find out if it also happens in areas without GSM buzz.
