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Update README

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This commit is contained in:
Gregory Nutt 2019-01-22 14:44:57 -06:00
parent a8da0e977a
commit 4c232c5ade
1 changed files with 29 additions and 8 deletions
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37
configs/beaglebone-black/README.txt
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@ -69,6 +69,19 @@ Serial Console
By default, the serial console will be provided on UART0 in all of these
configurations.
UART0 is available on the 6-pin Debug connector:
Pin 1: GND
Pin 2: N/C
Pin 3: N/C
Pin 4: B_UART0_RX / UART0_RX / PIN E15
Pin 5: B_UART0_TX / UART0_TX / PIN E16
Pin 6: N/C
PIN E16: UART0_TXD/SPI1_CS1/DCAN0_RX/I2C2_SCL/ECAP1_IN_PWM1_OUT/
PR1_PRU1_PRU_R30_15/PR1_PRU1_PRU_R31_15/GPIO1_11
PIN E15: UART0_RXD/SPI1_CS0/DCAN0_TX/I2C2_SDA/ECAP2_IN_PWM2_OUT/
PR1_PRU1_PRU_R30_14/PR1_PRU1_PRU_R31_14/GPIO1_10
LEDs
====
@ -76,10 +89,14 @@ LEDs
Two are tied to ground and, hence, illuminated by driving the output pins to a high
value:
1. LED0 GPMC_A5 GPMC_A5/GMII2_TXD0/RGMII2_TD0/RMII2_TXD0/GPMC_A21/PR1_MII1_RXD3/eQEP1B_IN/GPIO1_21
2. LED1 GPMC_A6 GPMC_A6/GMII2_TXCLK/RGMII2_TCLK/MMC2_DAT4/GPMC_A22/PR1_MII1_RXD2/eQEP1_INDEX/GPIO1_22
3. LED2 GPMC_A7 GPMC_A7/GMII2_RXCLK/RGMII2_RCLK/MMC2_DAT5/GPMC_A23/PR1_MII1_RXD1/eQEP1_STROBE/GPIO1_23
4. LED3 GPMC_A8 GPMC_A8/GMII2_RXD3/RGMII2_RD3/MMC2_DAT6/GPMC_A24/PR1_MII1_RXD0/MCASP0_ACLKX/GPIO1_24
1. LED0 GPMC_A5 GPMC_A5/GMII2_TXD0/RGMII2_TD0/RMII2_TXD0/GPMC_A21/
PR1_MII1_RXD3/eQEP1B_IN/GPIO1_21
2. LED1 GPMC_A6 GPMC_A6/GMII2_TXCLK/RGMII2_TCLK/MMC2_DAT4/GPMC_A22/
PR1_MII1_RXD2/eQEP1_INDEX/GPIO1_22
3. LED2 GPMC_A7 GPMC_A7/GMII2_RXCLK/RGMII2_RCLK/MMC2_DAT5/GPMC_A23/
PR1_MII1_RXD1/eQEP1_STROBE/GPIO1_23
4. LED3 GPMC_A8 GPMC_A8/GMII2_RXD3/RGMII2_RD3/MMC2_DAT6/GPMC_A24/
PR1_MII1_RXD0/MCASP0_ACLKX/GPIO1_24
These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
defined. In that case, the usage by the board port is defined in
@ -185,7 +202,11 @@ Configurations
This configuration directory provide the NuttShell (NSH). There are
STATUS:
Work in progress. Till now it is possible to pass arm_boot(), but Prefetch abort
is met when devnull_register() call is done. Have no idea why. I was able to trace
down to _inode_search() call. If I put any debug statement like "up_lowputc('0');"
right after "desc->node = node;" statement at line 425 the code does not crash.
2019-01-06: Work in progress. Till now it is possible to pass arm_boot(), but
Prefetch abort is met when devnull_register() call is done. Have no idea why.
I was able to trace down to _inode_search() call. If I put any debug statement
like "up_lowputc('0');" right after "desc->node = node;" statement at line 425
the code does not crash.
2019-01-09: The NSH configuration is now functional.
2019-01-16: Correct timer interrupts by switching to DMTimer2 (DMTimer1ms is
not initialized by U-Boot).