From efd0eb35af5e5620331d885d3140c734a6fc9098 Mon Sep 17 00:00:00 2001 From: Werner Zeh Date: Tue, 12 Sep 2017 08:58:44 +0200 Subject: siemens/mc_apl1: Add delay to wait for legacy devices There are old legacy onboard devices which are too slow for a coreboot boot with log level BIOS_ERR. In this case coreboot is so fast that these devices do not have enough time to become visible on the PCI bus and this in turn leads to missing resource allocation for this devices. The most generic way to work around this problem on existing hardware is to introduce a delay right before the PCI enumeration starts. The needed delay time depends on the hardware and will therefore be get from hwinfo. Change-Id: Ia91babc81e3a347bbc498c3def97b2ea70e10922 Signed-off-by: Werner Zeh Reviewed-on: https://review.coreboot.org/21518 Tested-by: build bot (Jenkins) Reviewed-by: Mario Scheithauer --- src/mainboard/siemens/mc_apl1/mainboard.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'src') diff --git a/src/mainboard/siemens/mc_apl1/mainboard.c b/src/mainboard/siemens/mc_apl1/mainboard.c index d8374fc2a4..fb849f9872 100644 --- a/src/mainboard/siemens/mc_apl1/mainboard.c +++ b/src/mainboard/siemens/mc_apl1/mainboard.c @@ -23,6 +23,9 @@ #include #include #include +#include +#include +#include #include "brd_gpio.h" #include "ptn3460.h" @@ -141,6 +144,34 @@ static void mainboard_final(void *chip_info) } } +static void wait_for_legacy_dev(void *unused) +{ + uint32_t legacy_delay, us_since_boot; + struct stopwatch sw; + + /* Open main hwinfo block. */ + if (hwilib_find_blocks("hwinfo.hex") != CB_SUCCESS) + return; + + /* Get legacy delay parameter from hwinfo. */ + if (hwilib_get_field(LegacyDelay, (uint8_t *) &legacy_delay, + sizeof(legacy_delay)) != sizeof(legacy_delay)) + return; + + us_since_boot = get_us_since_boot(); + /* No need to wait if the time since boot is already long enough.*/ + if (us_since_boot > legacy_delay) + return; + stopwatch_init_msecs_expire(&sw, (legacy_delay - us_since_boot) / 1000); + printk(BIOS_NOTICE, "Wait remaining %d of %d us for legacy devices...", + legacy_delay - us_since_boot, legacy_delay); + while (!stopwatch_expired(&sw)) + ; + printk(BIOS_NOTICE, "done!\n"); +} + +BOOT_STATE_INIT_ENTRY(BS_DEV_ENUMERATE, BS_ON_ENTRY, wait_for_legacy_dev, NULL); + struct chip_operations mainboard_ops = { .init = mainboard_init, .final = mainboard_final, -- cgit v1.2.3