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#REDIRECT [[Boot parameters]] |
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__NOTOC__ |
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= Boot Parameters = |
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== SCSI Hard drive not present == |
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This issue is more related to SCSI raid on servers, and an indication that it is happening is the following message at boot time, just after grub is launched. |
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<pre><nowiki> |
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Volume group "VolGroup00" not found |
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</nowiki></pre> |
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The way to fix this issue is adding to the kernel the `scsi_mod.scan=sync` parameter. |
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== Serial ports available == |
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By default, only 4 serial ports are present on linux, known as `/dev/ttyS[0-3]`, but it happens that some times is necessary to handle more ports in order to reach any other devices hooked on such ports. |
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Before tell the kernel how many port it should mount, it will be necessary to copy from BIOS the `port` and `IRQ` for the needed ports. |
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Then we need to ensure that new serial ports are being set properly on boot time, it could be done by adding the command following command to `/etc/rc.local` file: |
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<pre><nowiki> |
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setserial /dev/ttySn irq N port 0xDDDD uart 16550A baud_base 115200 |
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</nowiki></pre> |
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Where: |
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* `ttySn` is the port to be set |
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* `N` is the IRQ number |
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* `0xDDDD` is the port in four digits format |
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Also the speed could be modified in order to accomplish the device requirements. |
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To add more ports add to the kernel the `8250.nr_uarts=N` parameter, where `N` is the total desired amount of ports available. |
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== AMD Graphic card doesn't come up on boot == |
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On AMD Geode LX based terminals, the graphic card doesn't works with the standard frame buffer driver, that means the parameters `xdriver=vesa vga=792` won't work, or maybe yes but soonest will turn blank the screen and stop to work. |
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To solve this issue on AMD Geode terminals add to the kernel the `lxfb.mode_option=1024x768` parameter. ''1024x768'' could be changed to match the size of current monitor. |
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Latest revision as of 17:43, 9 June 2015
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