Hi Ben,
I had no hardware for a about a week but now I have an AM1808 experimenter's kit again and can continue investigating this issue.
On this board, older versions of u-boot (like v2009.11) boot perfectly, even when TI's UBL boot loader is not used (instead the configuration of DDR memory was done using an AIS script). However, since commit f1d2b313c9eb6808d30c16a9eb5251240452a56c u-boot boots only when used in conjunction with TI's UBL boot loader. When used without UBL, u-boot showed no sign of life on the serial port.
The content of the .ini file to build the AIS script using the HexAIS tool was
[General] busWidth=8 BootMode=SPIMASTER crcCheckType=NO_CRC [PLLANDCLOCKCONFIG] PLL0CFG0 = 0x00180001 PLL0CFG1 = 0x00000205 PERIPHCLKCFG = 0x0000000a [EMIF3DDR] PLL1CFG0 = 0x15010001 PLL1CFG1 = 0x00000002 DDRPHYC1R = 0x000000C4 SDCR = 0x0A034622 SDTIMR = 0x184929C8 SDTIMR2 = 0xB80FC700 SDRCR = 0x00000406 CLK2XSRC = 0x00000000 [INPUTFILE] FILENAME=u-boot.bin LOADADDRESS=0xC1080000 ENTRYPOINTADDRESS=0xC1080000
After investigating the problem today I figured out that the reason for the problem is the configuration of LPSC for UART2. To make u-boot work, the following lines must be added to the .ini file to enable the UART2 PSC module:
[PSCCONFIG] LPSCCFG = 0x010D0003
This seems odd, since LPSC configuration is already done by board_init() in board/davinci/da8xxevm/da850evm.c. However, I guess this initialization is done too late, since arch/arm/lib/board.c calls other serial port related functions before board_init() is executed. When I move the LPSC configuration of UART2 to a board_early_init_f() function, u-boot boots even without the [PSCCONFIG] section in the .ini file. The patch below does the required modifications.
Ben, would you mind testing this patch on your board? Is this the correct way to address this problem?
Best regards, Christian
board/davinci/da8xxevm/da850evm.c | 7 ++++++- include/configs/da850evm.h | 1 + 2 files changed, 7 insertions(+), 1 deletions(-)
diff --git a/board/davinci/da8xxevm/da850evm.c b/board/davinci/da8xxevm/da850evm.c index 73eaa48..a864412 100644 --- a/board/davinci/da8xxevm/da850evm.c +++ b/board/davinci/da8xxevm/da850evm.c @@ -129,7 +129,6 @@ static const struct lpsc_resource lpsc[] = { { DAVINCI_LPSC_AEMIF }, /* NAND, NOR */ { DAVINCI_LPSC_SPI1 }, /* Serial Flash */ { DAVINCI_LPSC_EMAC }, /* image download */ - { DAVINCI_LPSC_UART2 }, /* console */ { DAVINCI_LPSC_GPIO }, };
@@ -166,6 +165,12 @@ u32 get_board_rev(void) return rev; }
+int board_early_init_f(void) +{ + lpsc_on(DAVINCI_LPSC_UART2); + return 0; +} + int board_init(void) { #ifndef CONFIG_USE_IRQ diff --git a/include/configs/da850evm.h b/include/configs/da850evm.h index bbb5a9b..5d0f5bf 100644 --- a/include/configs/da850evm.h +++ b/include/configs/da850evm.h @@ -42,6 +42,7 @@ #define CONFIG_SYS_HZ 1000 #define CONFIG_SKIP_LOWLEVEL_INIT #define CONFIG_SYS_TEXT_BASE 0xc1080000 +#define CONFIG_BOARD_EARLY_INIT_F
/* * Memory Info