Altera Cyclone V Development Kit
What is the relationship between the GPIO/GPI schematics name and the GPIO number in U-Boot on the SX flavour?
This board distinguishes between GPIO (General Purpose Input/Output) and and GPI (General Purpose Input).
Each SoC/FPGA has parts dedicated to I/O. These I/O interfaces are divided into banks. There is actually no relationship between the bank number and the pin number.
In the SX board the banks connected to the HPS are 6A, 6B, 7A, 7B, 7C, 7D.
| HPS_GPIOx | portX pin |
|---|---|
| HPS_GPIO[0:28] | portA[0:28] |
| HPS_GPIO[29:57] | portB[0:28] |
| HPS_GPIO[57:84] | portC[0:26] |
| HPS_GPI[0:13] | portC[13:26][1][2] |
For example:
| Schematics Name | HPS_GPIOx | portX pin |
|---|---|---|
| SD_CD_DAT3 | HPS_GPIO47 | portB[18][3] |
| USER_LED_HPS[3:0] | HPS_GPIO[41:44] | portB[12:15][4] |
| USER_PB_HPS[3:0]:USER_DIPSW_HPS[3:0] | HPS_GPI[4:11] | portC[17:24] |
Resources
| [PATCH 2/2] ARM: socfpga: Add support for HPS KEYs/SWs on SoCKit | http://lists.infradead.org/pipermail/linux-arm-kernel/2016-March/416682.html |
References
- ↑ http://git.arm.linux.org.uk/cgit/linux-arm.git/tree/arch/arm/boot/dts/socfpga_cyclone5_sockit.dts?id=466e90ca2138c92b1e47d919237488b445b44d73#n156
- ↑ https://www.altera.com/support/support-resources/knowledge-base/solutions/rd05162013_937.html
- ↑ http://git.arm.linux.org.uk/cgit/linux-arm.git/tree/arch/arm/boot/dts/socfpga_cyclone5_socdk.dts?id=a7f9dac38c0c500aaaf5335d904c5a48584f0eeb#n127
- ↑ http://git.arm.linux.org.uk/cgit/linux-arm.git/tree/arch/arm/boot/dts/socfpga_cyclone5_socdk.dts?id=a7f9dac38c0c500aaaf5335d904c5a48584f0eeb#n42