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| author | Jorge Ramirez-Ortiz <jorge@foundries.io> | 2021-10-13 15:48:00 +0200 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2021-10-21 08:51:00 +0200 |
| commit | 398a74ae330dfc4e46744874ebbe5394d2679c37 (patch) | |
| tree | 4b3bc5664a06959f948d828aef4cc70e946f8fc9 /board/xilinx/zynqmp/zynqmp.c | |
| parent | a3e3d4698e3c5812bba76cf0f35a0f71b27d5973 (diff) | |
| download | u-boot-398a74ae330dfc4e46744874ebbe5394d2679c37.zip u-boot-398a74ae330dfc4e46744874ebbe5394d2679c37.tar.gz u-boot-398a74ae330dfc4e46744874ebbe5394d2679c37.tar.bz2 | |
zynqmp: restore the jtag interface
When boot.bin is configured for secure boot the CSU will disable the
JTAG interface on all cases.
Some boards might rely on this interface for flashing to QSPI in which
case those systems might end up bricked during development.
This commit will restore the interface under CSU control
Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Link: https://lore.kernel.org/r/20211013134800.19452-1-jorge@foundries.io
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'board/xilinx/zynqmp/zynqmp.c')
| -rw-r--r-- | board/xilinx/zynqmp/zynqmp.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/board/xilinx/zynqmp/zynqmp.c b/board/xilinx/zynqmp/zynqmp.c index 000a7cd..b24db53 100644 --- a/board/xilinx/zynqmp/zynqmp.c +++ b/board/xilinx/zynqmp/zynqmp.c @@ -358,6 +358,21 @@ static int multi_boot(void) return multiboot; } +#if defined(CONFIG_SPL_BUILD) +static void restore_jtag(void) +{ + if (current_el() != 3) + return; + + writel(CSU_JTAG_SEC_GATE_DISABLE, &csu_base->jtag_sec); + writel(CSU_JTAG_DAP_ENABLE_DEBUG, &csu_base->jtag_dap_cfg); + writel(CSU_JTAG_CHAIN_WR_SETUP, &csu_base->jtag_chain_status_wr); + writel(CRLAPB_DBG_LPD_CTRL_SETUP_CLK, &crlapb_base->dbg_lpd_ctrl); + writel(CRLAPB_RST_LPD_DBG_RESET, &crlapb_base->rst_lpd_dbg); + writel(CSU_PCAP_PROG_RELEASE_PL, &csu_base->pcap_prog); +} +#endif + #define PS_SYSMON_ANALOG_BUS_VAL 0x3210 #define PS_SYSMON_ANALOG_BUS_REG 0xFFA50914 @@ -377,6 +392,10 @@ int board_init(void) zynqmp_pmufw_load_config_object(zynqmp_pm_cfg_obj, zynqmp_pm_cfg_obj_size); printf("Silicon version:\t%d\n", zynqmp_get_silicon_version()); + + /* the CSU disables the JTAG interface when secure boot is enabled */ + if (CONFIG_IS_ENABLED(SPL_ZYNQMP_RESTORE_JTAG)) + restore_jtag(); #else if (CONFIG_IS_ENABLED(DM_I2C) && CONFIG_IS_ENABLED(I2C_EEPROM)) xilinx_read_eeprom(); |