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x1000: bootloader: fix Linux self-extracting kernel boot

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Basically, there's longstanding bug in Linux with self-extracting
kernels on MIPS which just happened to manifest now on the M3K as
a hang on boot. The fix is applied to the M3K and Q1 since they
both use this type of kernel image.

Change-Id: I17d2bad6eebd677cd6d2e0bf146450c71fcf1229
This commit is contained in:
Aidan MacDonald 2022-03-16 15:39:18 +00:00
parent 44fbb1a593
commit 6a6c6083fa
4 changed files with 143 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

42
bootloader/x1000/boot.c
View file

@ -148,6 +148,35 @@ void boot_linux(void)
* Be careful when modifying this code.
*/
#if defined(FIIO_M3K) || defined(SHANLING_Q1)
uint32_t saved_kernel_entry __attribute__((section(".idata")));
void kernel_thunk(long, long, long, long) __attribute__((section(".icode")));
void kernel_thunk(long a0, long a1, long a2, long a3)
{
/* cache flush */
commit_discard_idcache();
/* now we can jump to the kernel */
typedef void(*entry_fn)(long, long, long, long);
entry_fn fn = (entry_fn)saved_kernel_entry;
fn(a0, a1, a2, a3);
while(1);
}
static void patch_stub_call(void* patch_addr)
{
uint32_t* code = patch_addr;
uint32_t stub_addr = (uint32_t)(void*)kernel_thunk;
/* generate call to stub */
code[0] = 0x3c190000 | (stub_addr >> 16); /* lui t9, stub_hi */
code[1] = 0x37390000 | (stub_addr & 0xffff); /* ori t9, t9, stub_lo */
code[2] = 0x0320f809; /* jalr t9 */
code[3] = 0x00000000; /* nop */
}
#endif
static __attribute__((unused))
void boot_of_helper(uint32_t addr, uint32_t flash_size, const char* args)
{
@ -157,6 +186,19 @@ void boot_of_helper(uint32_t addr, uint32_t flash_size, const char* args)
if(handle < 0)
return;
#if defined(FIIO_M3K) || defined(SHANLING_Q1)
/* Fix for targets that use self-extracting kernel images */
void* jump_addr = core_get_data(handle);
uint32_t entry_addr = mips_linux_stub_get_entry(&jump_addr, img_length);
if(entry_addr >= 0xa0000000 || entry_addr < 0x80000000) {
splash2(5*HZ, "Kernel patch failed", "Please send bugreport");
return;
}
saved_kernel_entry = entry_addr;
patch_stub_call(jump_addr);
#endif
gui_shutdown();
x1000_dualboot_load_pdma_fw();

5
bootloader/x1000/x1000bootloader.h
View file

@ -41,13 +41,12 @@ struct uimage_header;
# define BL_SELECT_NAME "PLAY"
# define BL_QUIT_NAME "POWER"
# define BOOTBACKUP_FILE "/fiiom3k-boot.bin"
// FIXME: OF kernel hangs on the m3k
//# define OF_PLAYER_NAME "FiiO player"
# define OF_PLAYER_NAME "FiiO player"
# define OF_PLAYER_ADDR 0x20000
# define OF_PLAYER_LENGTH (4 * 1024 * 1024)
# define OF_PLAYER_ARGS OF_RECOVERY_ARGS \
" init=/linuxrc ubi.mtd=3 root=ubi0:rootfs ubi.mtd=4 rootfstype=ubifs rw loglevel=8"
//# define OF_RECOVERY_NAME "FiiO recovery"
# define OF_RECOVERY_NAME "FiiO recovery"
# define OF_RECOVERY_ADDR 0x420000
# define OF_RECOVERY_LENGTH (5 * 1024 * 1024)
# define OF_RECOVERY_ARGS \